Why are m43 lenses not much smaller than some APS-C?

I appreciate it, but I just feel the need to call out what it clear and apparent. I find James's post clearly misses the point and it happens with enough frequency to call BS on the one claiming to be calling out the BS. Where the argument is about portability or anything that praises the system on its actual merits he turns it quickly into a tired equivalence argument and an in to express FF's superiority where nobody was really asking. Where it really comes to the question of put up or shut up, I prefer to put up.

That "I shoot M43" is not out for what is clear and obvious
Easiest cure for staring at size and weight tables is walking into the camera store (itself an endangered species) and handling the gear. There is so much crossover between m4/3 and APS as to render bigger/smaller better/worse discussions moot.

Buy the one that you have the greatest affinity for and never look back. There lies forum madness.

Rick
I only buy from bricks and mortar, whilst there is certainly cross over with and even to a small extent FF - M43 still holds the crown for overall portability and capability vs apsc. Especially where it equates to how the system packs and overall lens choices. Nothing matches the small prime line up. 9mm >75mm in apsc. Nor is it really touching 12-45 40-150f4 zooms. 12-150 f2.8 or 12>100 f2.8 zooms for overall quality.

There are always caveats with apsc IMO that make M43 the easier choice if portability and system coherence are a premium. Fuji is the best choice in apsc. Sony and Canikon really lack overall where lens choices and body features matter.
 
I have recently had the chance to play a bit with a friend's OM EP-7, and I really liked it. However, I looked into some of the lens options, and it seems to me that, for the same 35mm equivalent focal length, many M43 lenses are basically the same size as many Sonys APS-c, despite the different crop factor (2.0x vs 1.5x)

For example:

the Sony 35mm F1.8 prime lens is 45mm long, and the Zuiko 25mm F1.8 is 42mm

The Sony 16-70mm F4 is 75mm and the Zuiko 12-40mm F2.8 is 84mm (the Zuiko is faster, but, still)

I start to see some differences with non-particularly fast tele lenses, like:

The Sony 55-210mm F4.5-6.3 is 108mm, while Zuiko 40-150mm F4-5.6 is 83mm

Is the explanation that faster lenses are always bulkier and longer? Even so, shouldn't m43 lenses be smaller anyway?

Please note, this is just curiosity - I'd like to understand what I am missing, and what the physics and technicalities behind it are.
I would point out two things:

1. Everything is a compromise in lens design.

2. It doesn't much matter what lens you use, as what you point it at.
 
<snip>

I guess owning an XA2, Camedia C-4000, OM1 with OM mount, E500, E30, EM1, EM1.2, OM1 and OM5 makes me one of those Olympus fans. The GM1 at times has been my most carried camera because it’s small and orange. I get dissed for liking IBIS and PDAF, so be it. Not a fan of big bodies either.

Shooting Sony FE is another black mark, especially as they have smaller bodies than some other mounts, mentioning no names.
I’ve had people on this forum ask me to show them photos proving why I prefer the output from my FF setup for certain use case scenarios. I don’t do so for three reasons. One, many of my shots are of my family, and I am not posting photos of them for everyone to peruse. Two, I’ve posted other photos here in the past- as have others- and I find people are more interested in talking about gear/specs (fair) or arguing, than in reviewing photographic output. Third and most importantly, we have no obligation whatsoever to justify to anyone else on this forum why we prefer to shoot with whatever brand camera, lens, or format
Shooting landscape is a great help in being able to illustrate why I chose particular gear, what the strengths and weaknesses of any kit are for me, and how to manage limits etc.

All my choices start from having quite a selection of real gear in my cupboard, and what suits me for any outing. I do get it wrong - the GM1 is not great for capturing that key moment. It is great for going out on a tourist outing.

Carrying an A7R2 up a hill under my cagoul on a freezing wet day was not my greatest photo experience, especially wrangling a tripod as well.

You can tell who is serious from how they engage with real examples.
Regardless of whether folks agree or not with each other, I am not fond of the IGNORE functionality. Yes, it is necessary in some cases- not denying that. But folks shouldn’t be using it to create an echo-chamber. So thank you danart for not hitting the IGNORE button on this convo1
It always seems odd when people threaten to IGNORE you.

Andrew
 
m43 is an excellent system I have like most folk here spent thousands on it over the years since 2009.
James, yet you constantly backhand troll the system here. You do little more than recite paper specs, test charts, or DPReview samples under the guise of "know-it-allism".
If I make a erroneous claim or make a mistake ( it happens ) I am happy to be corrected way too many here are not so inclined
I corrected your size comparisons

https://www.dpreview.com/forums/post/68222448
You posted lenses that do a different job ergo not equivalent . Equivalence is about getting the same results or as close as possible on different formats . Not about maintaining the advantage or disadvantage of a format.

Equivalent being same diagonal AOV, same DOF/same subject isolation and same total light gathering . The point of equivalence is not to get a better results but to match the other as much as possible

A m43 lens at F/1.2 , 200ISO and 1/60th , will have the same noise and DOF as a FF camera taken at F/2.4 ,800 ISO and 1/60th ( it should read Z6 II I got carried away with mi I's

6d8b068796124387adbc09761cc7722e.jpg
You claim people are somehow "unrealistically" defending the M43 system—people who actually use it for professional output.
?? What are you talking about here I have often commented on the skills and images of photographers here. Though on the other hand despite it being a public forum folk take offence if you point out any issues with an image they post. I could not care less if folk criticise or hate images I post.

Despite absolute evidence to the contrary ( bearing in mind I own an OM-1 ) there are still folk posting that they can get just as good results 2 stops higher than previous models , it is BS
Yet, on the other hand, you make ridiculous claims about Sony 1-inch compacts or the RX10 achieving "equivalence" with M43 and lenses such as the 300mm f/4.
I don't do that, I point out the difference between comparing apples to oranges, just as those who compare the small 300mm F/4 to a FF 600mm F/4 the RX10 IV does not do the same job as a the 300mm F/4 though it is closer than the 300mm is to the FF 600mm. The same folk posting the comparison to the 600mm F/4 take deep offence at the comparison with the RX10 IV :-)

You might be surprised just how good the RX10 IV lens is:

https://www.dpreview.com/reviews/sony-cyber-shot-dsc-rx10-iv/4

"24-600mm equivalent F2.4-4 lens is optically excellent"
Equivalence is not constant, sorry. M43 can reach parity because it has dedicated glass.
Even modest FF lenses such as AF F/1.8 lenses which are legion ( from as wide as 14mm out to 135mm ) have no parity in m43 I may have missed it but I am almost certain there are no AF f/0.9 lenses
One-inch superzooms or cropping the hell out of a Z9 is not getting you M43 equivalence.
Sure right up until you compare the end results , there are good reasons why this forum is seen as a laughing stock elsewhere. 95% of ILC users prefer larger sensor cameras than m43 , the inference here being that they are all fools for not embracing the m43 religion
I compared your results - you had no rebuttle.

https://www.dpreview.com/forums/post/68207829
I am sorry I never noticed your rebuttal :-) I used a sample image as I don't have that lens so I had no control on how it was taken . All software usable on m43 is also usable on other formats to compare like to like images you need controlled settings hence why I favour using DPreviews raw samples
I find your paper specs tiresome because I have yet to see an actual photo that backs up your claims.
Then don't read them. I post facts easily confirmed by the references I mention in such posts. And I don't mind being called out if I make a mistake , I will not make the same mistake again
I just see rather laughable examples of the same DPR bird crops you call "equivalent"—where I just see rubbish,
Good lord man there are folk posting images from the om-1/ii with the 150-400mm f4.5 that are awful with a near £9000 combo, just as there are folk posting excellent images with the same gear
Again if youre seeing a comparable result with your DPR bird crops, I'm not sure where you find yourself in a position to be calling out quality

https://www.dpreview.com/forums/post/68207829
I have no need to crop images I can fill the frame with my subjects with the appropriate focal lengths I need . I do not shoot long lenses very often my longest FF lens is the 180-600mm which gives me 45mp at 600mm and F/6.3 ( m43 equiv 300mm F/3.2 } . I have the 1.4x TC which I have hardly used , but that gives me a 45mp 900mm F/8.8 ( m43 equiv 450mm F/4.8 } and focusing in daylight where I would use such a combo is not a problem.

While not always possible I can get closer to my subjects as none of them here are liable to eat me. There are folk in the forum saying they absolutely need to use an 2X tc on the 150-600mm to get a mighty 1200mm F/12.6 a FF 2400mm F/25 ! ( funnily no one challenges how this will affect AF speed ) because they are shooting from car parks or out their home window. To be clear there is absolutely nothing wrong with this shoot however you want
coming from someone with far too much time on their hands.
I post photos here and in every forum I take part in but it is nothing but a strawman stance it is a gear forum on a gear review site so technical discussions are hardly a surprise . There used to be a rule restricting the amount of images posted in a thread

I do appreciate that facts and legitimate comparisons go down like a lead balloon with some here
You post other peoples photos and results from all I have seen.
I post controlled raw samples freely available to everyone. If discussing a technical subject obviously I post images of my own and as I say I have no problem with folk hating them
It seems the only reason you own an M43 setup is so you can justify your trolling here. There is no ; it reads very clearly.
Oh dear , dropping the troll allegation :-) the problem with this forum is and always has been the rampant fanaticism of primarily OM/Olympus , many of whom live in a fact free bubble. And take offence at being called out. It is very simple if folk want to cry about folk responding to nonsensical comparisons with FF don't make them

Luckily reading and responding to posts is entirely optional , DPreview provides a handy ignore button. I prefer not to as you miss out on so much comedy
Yet you are probably one of the most frequent posters on the group and post the same tired comparisons that get called out, and you just keep posting them.
They get called out incorrectly by folk not comparing apples to oranges as you did in the link you posted above. And taking offence for not praying at the alter . An awful lot of posters here think that the only replies should be pats on the head and atta boy no matter what

These lenses will not do the same job ergo they are not equivalent . If you seriously think that you will get the same DOF/subject isolation, total light gathering and resolution using these lenses on a 20mp m43 camera compared to a 61mp FF camera your are dreaming

d50d41ecea3f4d85bb096c7557ee3714.jpg
If there is an opptunity to back hand the system; you're there. I don't make the allegation lightly, but if it walks like a duck and talks like a duck...
My problem is not with the system but rather with the fanatics and of course anyone new to the format who may be given unrealistic misinformation

--
Jim Stirling:
"To argue with a person who has renounced the use of reason, is like administering medicine to the dead." - Thomas Paine
Feel free to tinker with any photos I post
 
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It always seems odd when people threaten to IGNORE you.

Andrew
My favourite is when folk reply to you to tell you they are ignoring you :-)
 
One last thing, and I’m in the minority here on this, size is inconsequential to me if it can do what I need and do it with the IQ I want at a reasonable cost. Sony, Fuji, Canon, Nikon have nothing of interest for me as a APSC system - they might have one or two good lenses here or there, but nothing I would build a system on. FF and M43 are the only two formats I would consider if I had to completely start from scratch.
I am happy with my m43 and FF combo , APS does not have a lot of appeal for me either. Fuji has quite a comprehensive selection of lenses for APS
They have a few lenses I like, but maybe only 1 or two I would consider using, and not enough for me to build a system on. And if I picked out the best lenses I could I would be annoyed using the system. It’s totally not for me.
, and there are some interesting third party options for Sony especially the Sigma 10-18mm F/2.8 for example
Meh, it’s fine. I won’t knock it’s IQ, but, I would always choose my 8-25/4 over it - regardless of the lighting or situation. The Nikon Z DX 12-28/4 PZ gets good marks too, but again, it’s an easy, easy pass, for me. OMMV.
As I said I am not really tempted by APS , though the new Z50 II does move things on a good bit .
eh.

The lack of IBIS alone means the Z50 II is an automatic hell no. The abysmal battery life that can't even match my EM10 from 11 years ago is a frustrating joke. There a bunch of other changes I'd make to it if I was in charge over there... but it doesn't matter, Nikon doesn't care about enthusiasts. They use dumb, slow, unimaginative, lenses and hope people will just move up quickly to their FF system that actually has some useful glass.

If I had to describe Nikon's (and Canon's) APSC system in a few words it would be:
"The practice pancake"
As I use Z FF i already have a selection of lenses but m43 will do just fine . The 12-28 seems to get good reviews . I would mostly use such lens in daylight so in lens VR would suffice
But the IBIS in my EM1.3 is far better, the IQ of my 8-25 is far better (minus lens in some situations - it's a great lens and very close to but not quite perfect - More than good enough for me.
Since you’re here…😉

Regarding the 12-100/4 vs the 24-200/4-6.3, as much as I like Nikon’s cameras, and also given that the 24-200 is the best of these FF 2x-2xx lenses, I’d still choose the 12-100/4 over it. This, is definitely a for me only situation. My 12-100 lets me leave my tripod/monopod at home. I also love the consistent IQ even at the corners on it. That and my 8-25/4 are a dream combo. I was in Canyon Lands National Park earlier today and at the Moab Easter Jeep Safari days prior, and having those two lenses meant I never missed a shot, and I changed lenses less often than I would have with any other two lens combo.
The 8-25mm does tempt. I only used the 24-200mm to match focal lengths and of course it us doing the same job as m43 12-100mm F/2-3.2.
Only on DoF, which is the last thing of consideration to me on such a lens. Truthfully it's of no consideration since being a landscape shooter, larger DoF is what I actually want. For me it works out well that the 12-100/4 does 3 things, 1) give me a FF DoF of F8 while 2) simultaneously giving me shutter speeds of an F4 lens, 3) coupled with and EM1/OM1 series lets me shoot at sub 2sec shutter speeds as needed. Its a win-win-win. All my regular landscape shots have enough dof while letting me use the lens at it's optimal settings at every focal length. I can also keep my ISO at base even when the light get lower because the stabilization has no equal and may not have for years.
It gets some decent reviews and on my Z7II or Z9 would comfortably out resolve the 12-100mm.
For me the out resolving is not the issue, I have no doubt Z7 - Z9 would "out resolve" it. It the inconsistent performance - especially at the wide end that would be the deal breaker. The best thing about the Z24-200 is that it's center performance is great at both ends of the range, but edges/corners at the wide end can't even get close to the center where as the 24-120/4 can. And If I was forking out the cash for a Z9, I would never use the 24-200 on it. Especially since the 24-120/4 doesn't cost that much more. Toss in a 70-180/2.8 (since Nikon can't pull their heads out their @$$ and make a 70-200/4 since 2012) and you've got the range and far better IQ with the trade offs being weight and swapping; cost too to a lesser degree for anyone able to buy a Z9.
It is system results that matter , technically the 12-100mm may be a better optic but when on a m43 camera compared to the 24-200mm on FF my money would be on the FF lens
Maybe on the Z7II (unless you need better AF performance - I don't), Z8, and Z9, but since the 24-12/4 came out I see no reason to buy the 24-200 for the higher end bodies. That's just me, I've seen people but worse glass on great cameras. (I saw someone shooting a Sony 28-70 yesterday and that made me laugh)
https://www.zsystemuser.com/z-mount...t-lens-reviews/nikon-24-200mm-f4-63-lens.html

https://photographylife.com/reviews/nikon-z-24-200mm-f4-6-3-vr

I think Nikon did well with the 24-200, it’s not perfect (and the Z24-120/4 is better and more of interest to me) but it will be good enough for many. I’m just not included in that group.
I have the 24-120mm it is a very good performer . And covers a good chunk of my shooting . I have the 14-30mm and they make a good pair. I did have the 14-24mm F/2.8 s and though it was an excellent lens I found that most of my shooting with it was done stopped down so the 14-30mm won out for size and weight .
With the advantages that mirrorless cameras allow for the lenses we have now are pretty much better than everything that came before it . Plus there are focal length and aperture combos that would have been impossible on DSLR's. I think it is hard to find a genuinely useless lens
Sony Zeiss E16-70/4 (Thankfully now discontinued - God be praised)

Fuji 16-80/4 (the 16-50/2.8-4 - with it's shorter range is night and day better)

Sony FE28-70/3.5-5.6

Canon RF24-240mm (because of corrections needed)

Sony FE24-240 (because of IQ or lack thereof)

Tamron 11-2mm (There are better lenses with better range)

Tamron 20-40mm (No reason to buy it as a better range Sony exists)

Tamron 17-50/4 (not good enough and the Sony 20-70/4 exists)

Olympus 12-50 (the old one)

Sigma 16-28/2.8

and this one will upset people...

Sigma 18-50/2.8 (They took my least favorite range and made it worse)

Panasonic 25/1.7 (sucks until F4)

...

I can go on, there's a lot of meh out there.

--
NHT
 
<snip>

I guess owning an XA2, Camedia C-4000, OM1 with OM mount, E500, E30, EM1, EM1.2, OM1 and OM5 makes me one of those Olympus fans. The GM1 at times has been my most carried camera because it’s small and orange. I get dissed for liking IBIS and PDAF, so be it. Not a fan of big bodies either.

Shooting Sony FE is another black mark, especially as they have smaller bodies than some other mounts, mentioning no names.
And I suppose I’m the opposite, preferring Panasonic MFT and FF. Size of the camera that I prefer depends on what I’m doing. For travel, something small enough that it doesn’t become the center of attention/distraction. But I’m moving slowly but surely to FF because for me the IQ delta between MFT and cameraphones in the wide to normal range isn’t that great. I’d rather go a little larger for a greater delta. For macro and tele photography, MFT has historically trumped everything else for me- and I prefer a bigger body for handling. Looking forward to seeing if S1R II with Sigma 500 w/1.4x TC changes my mind. But for others, like you, a different solution is best. Lots of good solutions out there.
I’ve had people on this forum ask me to show them photos proving why I prefer the output from my FF setup for certain use case scenarios. I don’t do so for three reasons. One, many of my shots are of my family, and I am not posting photos of them for everyone to peruse. Two, I’ve posted other photos here in the past- as have others- and I find people are more interested in talking about gear/specs (fair) or arguing, than in reviewing photographic output. Third and most importantly, we have no obligation whatsoever to justify to anyone else on this forum why we prefer to shoot with whatever brand camera, lens, or format
Shooting landscape is a great help in being able to illustrate why I chose particular gear, what the strengths and weaknesses of any kit are for me, and how to manage limits etc.

All my choices start from having quite a selection of real gear in my cupboard, and what suits me for any outing. I do get it wrong - the GM1 is not great for capturing that key moment. It is great for going out on a tourist outing.

Carrying an A7R2 up a hill under my cagoul on a freezing wet day was not my greatest photo experience, especially wrangling a tripod as well.

You can tell who is serious from how they engage with real examples.
Not necessarily. Some folks are private about what they post. I’ve seen some photos here that are very impressive, and others that are anything but- to me. Beauty is in the eye of the beholder, and if it brings the photographer joy, it doesn’t matter what I think. Even data-centric posts can be questionable nowadays, with some faulty data being labeled as gospel that later turns out to be false.
Regardless of whether folks agree or not with each other, I am not fond of the IGNORE functionality. Yes, it is necessary in some cases- not denying that. But folks shouldn’t be using it to create an echo-chamber. So thank you danart for not hitting the IGNORE button on this convo1
It always seems odd when people threaten to IGNORE you.
Yes
 
I looked through your meh lens list and thought - Oh Yes! Sony really did produce some early turkeys and Tamron occasionally went large, light, cheap and so-so.

A
 
I looked through your meh lens list and thought - Oh Yes! Sony really did produce some early turkeys and Tamron occasionally went large, light, cheap and so-so.

A
That’s my short list. My DSLR list of meh lenses looks like a set of Encyclopedia Britanicas. 😉

Sony actually ticks me off the most because they CAN make great glass, they just don’t sometimes for no good reason.
--
Infinite are the arguments of mages. Truth is a jewel with many facets. Ursula K LeGuin
Please feel free to edit any images that I post
--
NHT
 
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For example why is the Yongnou 17mm f1.7 so much bigger than the Olympus 17mm f1.8? They're both micro 4/3rds lenses, both 17mm and only a fraction of a difference in maximum aperture.

af371d68657542f184fb22430f71e80b.jpg
I don't know the answer but is it possible that the Yongnou is actually a lens with aps-c image circle that has been issued with a M4/3 mount. There are quite a few Chinese sourced lenses that serve double duty as aps-c lenses and can be found in M4/3 mount format as well. This save having to make a special lens formula solely for the M4/3 market.
Yongnuo has only ever made the 17mm in m43rds mount. There is no APS-C version.
 
You should also remember that an MFT f1.8 is not as fast as f1.8 APS-c.
You can buy an MFT to E-mount adapter, put an f/1.8 MFT lens on a Sony APS-C camera, and it's easy to see that many MFT lenses cover APS-C, and are therefore providing just as much light, and are just as fast.

You have to bear in mind that MFT lenses don't cover just the stated MFT sensor size: they cover the MFT sensor plus enough room for it to move in every dimension for IBIS, and they cover oversized MFT sensors like the GH1, GH2, and GH5s.
The light that gets absorbed by something other than the sensor, or the parts of the sensor that aren't used, doesn't count.
So a Canon EF-S f1.8 is not as fast as a Nikon DX f1.8?
 
m43 is an excellent system I have like most folk here spent thousands on it over the years since 2009.
James, yet you constantly backhand troll the system here. You do little more than recite paper specs, test charts, or DPReview samples under the guise of "know-it-allism".
If I make a erroneous claim or make a mistake ( it happens ) I am happy to be corrected way too many here are not so inclined
I corrected your size comparisons

https://www.dpreview.com/forums/post/68222448
You posted lenses that do a different job ergo not equivalent . Equivalence is about getting the same results or as close as possible on different formats . Not about maintaining the advantage or disadvantage of a format.

Equivalent being same diagonal AOV, same DOF/same subject isolation and same total light gathering . The point of equivalence is not to get a better results but to match the other as much as possible

A m43 lens at F/1.2 , 200ISO and 1/60th , will have the same noise and DOF as a FF camera taken at F/2.4 ,800 ISO and 1/60th ( it should read Z6 II I got carried away with mi I's
This was never the point of what I was stating. Which actually speaks to the real question. The question being portability and as always you show up with your example that misses the point. The point being where are the FF equivalent AF lenses that make FF “just as portable? Especially with the lenses I have posted and clearly stated that your post falsely assume one is chasing equivalence.

everyone bloody understands equivalence- it is really basic stuff, the only time it actually matters is where it is prohibitive to results. Rarely if ever is it - BUT again, why do I or anyone want to routinely make inferior photographs chasing a DOF of a 1.8 FF lens shot wide open?

This is the deepest flaw of your argument, because in fact the majority are chasing more DOF more often be it family group shots, architecture, landscapes or simply better framing around context.
6d8b068796124387adbc09761cc7722e.jpg
You claim people are somehow "unrealistically" defending the M43 system—people who actually use it for professional output.
?? What are you talking about here I have often commented on the skills and images of photographers here. Though on the other hand despite it being a public forum folk take offence if you point out any issues with an image they post. I could not care less if folk criticise or hate images I post.

Despite absolute evidence to the contrary ( bearing in mind I own an OM-1 ) there are still folk posting that they can get just as good results 2 stops higher than previous models , it is BS
Yet, on the other hand, you make ridiculous claims about Sony 1-inch compacts or the RX10 achieving "equivalence" with M43 and lenses such as the 300mm f/4.
I don't do that, I point out the difference between comparing apples to oranges, just as those who compare the small 300mm F/4 to a FF 600mm F/4 the RX10 IV does not do the same job as a the 300mm F/4 though it is closer than the 300mm is to the FF 600mm. The same folk posting the comparison to the 600mm F/4 take deep offence at the comparison with the RX10 IV :-)

You might be surprised just how good the RX10 IV lens is:

https://www.dpreview.com/reviews/sony-cyber-shot-dsc-rx10-iv/4

"24-600mm equivalent F2.4-4 lens is optically excellent"
Equivalence is not constant, sorry. M43 can reach parity because it has dedicated glass.
Even modest FF lenses such as AF F/1.8 lenses which are legion ( from as wide as 14mm out to 135mm ) have no parity in m43 I may have missed it but I am almost certain there are no AF f/0.9 lenses
One-inch superzooms or cropping the hell out of a Z9 is not getting you M43 equivalence.
Sure right up until you compare the end results , there are good reasons why this forum is seen as a laughing stock elsewhere. 95% of ILC users prefer larger sensor cameras than m43 , the inference here being that they are all fools for not embracing the m43 religion
I compared your results - you had no rebuttle.

https://www.dpreview.com/forums/post/68207829
I am sorry I never noticed your rebuttal :-) I used a sample image as I don't have that lens so I had no control on how it was taken . All software usable on m43 is also usable on other formats to compare like to like images you need controlled settings hence why I favour using DPreviews raw samples
Probably not, because it shows you’re wrong. i ran all samples including yours examples through the same software……my sample also provides a clear reference to an actual example of M43 quality. Where you conveniently post your FF sample with no comparison. Just inaccurate claims
I find your paper specs tiresome because I have yet to see an actual photo that backs up your claims.
Then don't read them. I post facts easily confirmed by the references I mention in such posts. And I don't mind being called out if I make a mistake , I will not make the same mistake again
I just see rather laughable examples of the same DPR bird crops you call "equivalent"—where I just see rubbish,
Good lord man there are folk posting images from the om-1/ii with the 150-400mm f4.5 that are awful with a near £9000 combo, just as there are folk posting excellent images with the same gear
Again if youre seeing a comparable result with your DPR bird crops, I'm not sure where you find yourself in a position to be calling out quality

https://www.dpreview.com/forums/post/68207829
I have no need to crop images I can fill the frame with my subjects with the appropriate focal lengths I need . I do not shoot long lenses very often my longest FF lens is the 180-600mm which gives me 45mp at 600mm and F/6.3 ( m43 equiv 300mm F/3.2 } . I have the 1.4x TC which I have hardly used , but that gives me a 45mp 900mm F/8.8 ( m43 equiv 450mm F/4.8 } and focusing in daylight where I would use such a combo is not a problem.

While not always possible I can get closer to my subjects as none of them here are liable to eat me. There are folk in the forum saying they absolutely need to use an 2X tc on the 150-600mm to get a mighty 1200mm F/12.6 a FF 2400mm F/25 ! ( funnily no one challenges how this will affect AF speed ) because they are shooting from car parks or out their home window. To be clear there is absolutely nothing wrong with this shoot however you want
This only supposes the only person that is relevant is James shooting in a vacuum. Probably explains why you think you’re “enlightening” the forum. Again it has nothing to do with the point that you were actually trying to make and that the fact that your claim was inaccurate…
coming from someone with far too much time on their hands.
I post photos here and in every forum I take part in but it is nothing but a strawman stance it is a gear forum on a gear review site so technical discussions are hardly a surprise . There used to be a rule restricting the amount of images posted in a thread

I do appreciate that facts and legitimate comparisons go down like a lead balloon with some here
You post other peoples photos and results from all I have seen.
I post controlled raw samples freely available to everyone. If discussing a technical subject obviously I post images of my own and as I say I have no problem with folk hating them
It seems the only reason you own an M43 setup is so you can justify your trolling here. There is no ; it reads very clearly.
Oh dear , dropping the troll allegation :-) the problem with this forum is and always has been the rampant fanaticism of primarily OM/Olympus , many of whom live in a fact free bubble. And take offence at being called out. It is very simple if folk want to cry about folk responding to nonsensical comparisons with FF don't make them

Luckily reading and responding to posts is entirely optional , DPreview provides a handy ignore button. I prefer not to as you miss out on so much comedy
Yet you are probably one of the most frequent posters on the group and post the same tired comparisons that get called out, and you just keep posting them.
They get called out incorrectly by folk not comparing apples to oranges as you did in the link you posted above. And taking offence for not praying at the alter . An awful lot of posters here think that the only replies should be pats on the head and atta boy no matter what

These lenses will not do the same job ergo they are not equivalent . If you seriously think that you will get the same DOF/subject isolation, total light gathering and resolution using these lenses on a 20mp m43 camera compared to a 61mp FF camera your are dreaming
If the question is portability, which I clearly point out, where are the FF equivalent slower lenses that make FF just as portable.

There are none available, and that is the clear point and why I’m calling out your own samples and screen shots. Your point is only relevant if one is chasing the equivalence of a FF lens’s shot wide open. As also mentioned when calling you examples out.and once again conveniently ignored or “unnoticed”
d50d41ecea3f4d85bb096c7557ee3714.jpg
If there is an opptunity to back hand the system; you're there. I don't make the allegation lightly, but if it walks like a duck and talks like a duck...
My problem is not with the system but rather with the fanatics and of course anyone new to the format who may be given unrealistic misinformation
The information you present is also not accurate or 100% realistic. (Far from it) That you believe that you’re privy to some information and “enlightening” the forum is probably the greatest issue I take with your posts. The defensiveness of the above clearly shows, you have tried to explain my posts outside of the clear context provided and for that and your actual comparisons. You are wrong
--
Jim Stirling:
"To argue with a person who has renounced the use of reason, is like administering medicine to the dead." - Thomas Paine
Feel free to tinker with any photos I post
Did tinker, did expose the flaws and misinformation in your posts. Will continue to do so.
 
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You should also remember that an MFT f1.8 is not as fast as f1.8 APS-c.

Aps-c systems have evolved and left M43 behind in my view.
You mean in terms of depth of field? You multiply by the crop factor to calculate the equivalence, right?

But in terms of how much light hits the lens, is f1.8 the same regardless of the crop factor?
Yes, in terms of DOF as the light value will be the same.

In terms of DOF, a m43 f1.8 is equivalent to an aps-c f2.4 I believe, so to get an equivalent, the aps-c lens would be smaller still.
The lens needs to exist. We cannot shoot with slower hypothetically smaller lenses….
 
I was merely pointing out that M4/3 regularly genuflects to the FF sensor kit as if it were the absolute pinnacle on the rock. Completely ignoring the larger Medium Format kit as if it could hardly better our deep fascination with the "enemy" FF sensor.

.... and here is "me" missing out noticing the wide poplar market for aps-c kit that is produced as a busy sideline by companies that arguably might be concentrating on selling higher margin based gear. Aps-c is far from dead and it is both alive and thriving. All the majors make some aps-c kit for those not yet convinced that they really need "FF". Or are they just cheapskates? (Joking) Darker thoughts might suggest that they feel the need to offer some aps-c kit to keep this side of the market from going elsewhere. Does this indicate that some of those buying from the majors actually prefer smaller sensors? Perish the thought .... :)

The fact is if your business is as "market leaders" in selling huge quantities of camera related kit they need to plug every niche that can be filled in retail showcases.

I did note that many lenses with aps-c image circles are sold in various mounts and that also this sometimes handily extends to having M4/3 mounts as well. The benefit for M4/3 is that we can often get more variety of choice than otherwise where it might not be seen "commercial" to build solely for the 4/3 image circle.

These lenses would not come from the registered base manufacturers for the M4/3 consortium but from those manufacturers that normally make for multiple mounts.

For some time Chinese firms, in shades of Legacy MF lenses, have been making quite reasonably priced brand new MF lenses for aps-c image circle (and other formats of course). These turn up as "M4/3" lenses as well - even with their wasted (unused) image circle. One might wonder if they could be made more compact if built down to the 4/3 image circle - but I suppose that being MF and not AF they would be technically on the more compact side anyway. If we want our lenses compact how about we try rand new lenses made for MF purposes only.

But I am hardly preaching to the converted here as I suspect that the vast bulk of M4/3 users prefer lenses with AF from the Oly-Panny Oi Oi Oi stable .... :)
 
It's crazy to me that we have to resort to letters and numbers from a random chart to determine why X lens is bigger/better than Y lens.

It's really simple. If I take a 50mm FF lens and then slap that sucker on MFT the FOV is similar to 100mm on a FF. It's the sensor and only the sensor that causes it.

So now if we want the inverse of that we'd need a 25mm lens on MFT to give a 50mm FOV on FF.

25mm is built differently than a 50mm. Simple.

There are obviously other variables (optics, sensor coverage, motor drive, etc.) but that's all it really boils down to.

--
www.instagram.com/steven_portraits
 
You should also remember that an MFT f1.8 is not as fast as f1.8 APS-c.
You can buy an MFT to E-mount adapter, put an f/1.8 MFT lens on a Sony APS-C camera, and it's easy to see that many MFT lenses cover APS-C, and are therefore providing just as much light, and are just as fast.

You have to bear in mind that MFT lenses don't cover just the stated MFT sensor size: they cover the MFT sensor plus enough room for it to move in every dimension for IBIS, and they cover oversized MFT sensors like the GH1, GH2, and GH5s.
The light that gets absorbed by something other than the sensor, or the parts of the sensor that aren't used, doesn't count.
Yes in this case it does very much count, because Tifey did write about our m43 lenses adapted to APS-C E-mount body:

"You can buy an MFT to E-mount adapter, put an f/1.8 MFT lens on a Sony APS-C camera"

That is essentially the same as like us m43 people adapting a C-mont lens onto our m43 cameras. And in this case it similarly also matters a lot to us how much that particular C-mount lens "over-covers" the C-mount image circle specification.
I was reacting to the statement "providing just as much light". It's still a moot point if a sensor isn't capturing the light. Putting a bigger sensor behind the lens is interesting but in most cases not very practical.

The only m43 lenses that consistently deliver an APS-C image circle were probably designed for APS-C to begin with and just got manufactured with a m43 mount instead, like some of the Sigmas.
An m43 to (APS-C) E-mount adapter is a very thin beast (it actually has a negative thickness). Because m43 flange focal distance is 19.25mm, and Sony E-mount is 18mm.
Thanks for that, I have not and probably never will need to adapt E-mount to m43. Still interesting to hear about and see.
And why would anyone even consider to migrate to inferior APS-C from m43? Just thinking, but all I can think of, maybe it is because a 2014 Sony A5100 is soooooo much smaller (and lighter) than a Panasonic G100 (the smallest current m43 body you can buy)? Am I now a heretic for pointing this out? I hope not.
Denying reality just to avoid hurting someone's feelings would be kind of silly. But is an 11 year old camera still available or competitive? I'm sure there were smaller m43 cameras available in 2014. I see you also compare a current Sony, that's probably more instructive.
 
I have recently had the chance to play a bit with a friend's OM EP-7, and I really liked it. However, I looked into some of the lens options, and it seems to me that, for the same 35mm equivalent focal length, many M43 lenses are basically the same size as many Sonys APS-c, despite the different crop factor (2.0x vs 1.5x)

For example:

the Sony 35mm F1.8 prime lens is 45mm long, and the Zuiko 25mm F1.8 is 42mm

The Sony 16-70mm F4 is 75mm and the Zuiko 12-40mm F2.8 is 84mm (the Zuiko is faster, but, still)

I start to see some differences with non-particularly fast tele lenses, like:

The Sony 55-210mm F4.5-6.3 is 108mm, while Zuiko 40-150mm F4-5.6 is 83mm

Is the explanation that faster lenses are always bulkier and longer? Even so, shouldn't m43 lenses be smaller anyway?

Please note, this is just curiosity - I'd like to understand what I am missing, and what the physics and technicalities behind it are.
Lens size is generally driven by physical aperture and focal length plus construction crop factor is less relevant

The reason why most micro four thirds are small is because the physical aperture is also small and the construction is simple

this is why a lens like the 45/1.8 is small while the 45/1.2 isnt that small

When lenses match length and physical aperture the smaller entrance of micron four thirds does give a small advantage

However optically a full frame lens 2.8 lens is the same of a micron four thirds 1.4 so you see why when it comes to zoom you can easily have a 24-70 2.8 full frame but 12-35 1.4 doenst exist and pl 10-25 and 25-50 are big lenses
Quite correct and well put I like the use of the term "optically" and acknowledge that any f1.2 lens is still a very fast lens no matter what sensor it is built for.

Physical size is grounded by optical build constraints.
 
It's crazy to me that we have to resort to letters and numbers from a random chart to determine why X lens is bigger/better than Y lens.

It's really simple. If I take a 50mm FF lens and then slap that sucker on MFT the FOV is similar to 100mm on a FF. It's the sensor and only the sensor that causes it.
exactly and if we want a 100mm FOV on a FF camera we need a far larger lens.
So now if we want the inverse of that we'd need a 25mm lens on MFT to give a 50mm FOV on FF.

25mm is built differently than a 50mm. Simple.
Yes and it can be built differently and specifically to the image circle it needs to cover. Which being MFT is inherently smaller and therefore provides an all round (including dimeter) smaller lens.
There are obviously other variables (optics, sensor coverage, motor drive, etc.) but that's all it really boils down to.
And here M43 has that covered because it is a native format with optics specifically designed to address the smaller image circle
 
Duh, dumb me. :-) 45 x 1.5 =90. Is 1.5 the APSC "conversion factor"? IIRC in the pre-Sony days didn't Nikon & Canon differ? One was 1.5 and the other 1.6?
Yes, Canon was 1.6x from the beginning because they made their own sensors. Everybody else who used Sony sensors was 1.5x.

And so the crop from (most) APS-C to M4/3 is 1.33x.
Apart from Aps-h of course....
Are there any APS-H cameras still around ? I am not up on Canons video models so there may well be
I suspect APS-H only existed because FF sensors were so hard to make. That doesn't appear to be the case any more. I'd be extremely surprised if there were still any.
 
You should also remember that an MFT f1.8 is not as fast as f1.8 APS-c.
You can buy an MFT to E-mount adapter, put an f/1.8 MFT lens on a Sony APS-C camera, and it's easy to see that many MFT lenses cover APS-C, and are therefore providing just as much light, and are just as fast.

You have to bear in mind that MFT lenses don't cover just the stated MFT sensor size: they cover the MFT sensor plus enough room for it to move in every dimension for IBIS, and they cover oversized MFT sensors like the GH1, GH2, and GH5s.
The light that gets absorbed by something other than the sensor, or the parts of the sensor that aren't used, doesn't count.
Yes in this case it does very much count, because Tifey did write about our m43 lenses adapted to APS-C E-mount body:

"You can buy an MFT to E-mount adapter, put an f/1.8 MFT lens on a Sony APS-C camera"

That is essentially the same as like us m43 people adapting a C-mont lens onto our m43 cameras. And in this case it similarly also matters a lot to us how much that particular C-mount lens "over-covers" the C-mount image circle specification.
I was reacting to the statement "providing just as much light". It's still a moot point if a sensor isn't capturing the light. Putting a bigger sensor behind the lens is interesting but in most cases not very practical.

The only m43 lenses that consistently deliver an APS-C image circle were probably designed for APS-C to begin with and just got manufactured with a m43 mount instead, like some of the Sigmas.
An m43 to (APS-C) E-mount adapter is a very thin beast (it actually has a negative thickness). Because m43 flange focal distance is 19.25mm, and Sony E-mount is 18mm.
Thanks for that, I have not and probably never will need to adapt E-mount to m43. Still interesting to hear about and see.
Someone invested in E-mount may find something like an m43 mount Voigtlander Nokton at a good price, and will be happy to use it on an E-mount camera with a tiny and low cost adapter that does not add to overall length. But yes you are right, Voigtlander lenses were not designed for m43, just fitted with an m43 mount. That is true for many manual lenses.

The SLRmagic 8/4.0 was designed for m43. Like the Laowa 7.5/2.0. They likely cover the APSC image circle of a Sony A5100 or 6400, cause those lenses were designed for IBIS and the A5100/A6400 does (like many such small cameras even in m43) not have IBIS.
And why would anyone even consider to migrate to inferior APS-C from m43? Just thinking, but all I can think of, maybe it is because a 2014 Sony A5100 is soooooo much smaller (and lighter) than a Panasonic G100 (the smallest current m43 body you can buy)? Am I now a heretic for pointing this out? I hope not.
Denying reality just to avoid hurting someone's feelings would be kind of silly. But is an 11 year old camera still available or competitive?
Still available yes, but sought after and pricey. I own and use 4 GM bodies, GM1 was released in 2013 and GM5 in 2014.

The A5100 from 2014 is also pricey because sought after for its small size.

Still competitive, yes absolutely, by necessity. Because there is nothing new in that size/weight class. There are some people that want or need very small ILC gear, and they are not catered for by current production of any maker/brand/mount. They are forced to live off the used market.
I'm sure there were smaller m43 cameras available in 2014. I see you also compare a current Sony, that's probably more instructive.
I did that to show that even today, the size of an APSC camera is not any larger than the size of the smallest current m43 we have.
 
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