Will Oly 17mm 1.2 match Sigma 35mm ART?

Still, the question that I asked was whether for most a simpler, less corrected (and Olympus has gone to real extremes here, a 19 element standard prime is way beyond even Otus territory) might have been a more generally useful lens, one which would have given maybe T1.4.
There is some benefit to producing halo products, demonstrations of commitment and engineering that offer both a performance and pleasure of ownership.

Not all lenses are built with the sole aim of perfect transmission.
Quite agree. And if you choose to spend your money on halo products, you have every right to do so. I'm not suggesting that Olympus doesn't have every right to market these lenses (nearly said 'make' but that wouldn't be accurate), I'm just commenting on precisely what it is you're getting for the money.
 
Still, the question that I asked was whether for most a simpler, less corrected (and Olympus has gone to real extremes here, a 19 element standard prime is way beyond even Otus territory) might have been a more generally useful lens, one which would have given maybe T1.4.
There is some benefit to producing halo products, demonstrations of commitment and engineering that offer both a performance and pleasure of ownership.

Not all lenses are built with the sole aim of perfect transmission.
Quite agree. And if you choose to spend your money on halo products, you have every right to do so. I'm not suggesting that Olympus doesn't have every right to market these lenses (nearly said 'make' but that wouldn't be accurate), I'm just commenting on precisely what it is you're getting for the money.
Just to be accurate, you are focusing on one aspect of the product. Precisely speaking you are getting a 25mm f1.2 lens :)
--
Tinkety tonk old fruit, & down with the Nazis!
Bob
 
People make their purchase decisions on absolutely any criteria that they like. Their money, they can spend it as they wish
Yet you continue to drive the point that transmission is similar between the PL and mZD. That's not necessarily the driving force for others.
I'm just saying it how it is. How individuals make their purchase decisons on the basis of what anyone else says or thinks is quote up to them.
You must spend a lot of time shooting flat subjects, but if you do, then fine, that is your own need. I wonder in reality for how many people that is important.
I'm sure for some, soft edges are fine. But when your subject doesn't reside in the center of the frame it's a non-starter.
Neither of the lenses that we are talking about has 'soft edges'.

In any case, have a look at some pictures taken wide open with an f/1.2 or equivalent lens and see just how many have sharp detail in the corners. You'll find it's vanishingly small. In any case, most of the drop-off will be due to field curvature, which means that if you get the subject in the corner (in the very few cases that you do) with a focus point over it (big advantage of mirrorless, you can have focussing points in the corner) then the subject there will be in focus and sharp.
Doesn't have a lot to do with the question above.
It does if the alternative is using the PL. The question you're asking is hypothetical. No such lens exists. The reality is there are several advantages for using the PL over the mZD and vice-versa.
Third would be the rugged build quality and weather sealing.

Also has nothing to do with the question above.
Also an advantage comparing available lenses.
Still, the question that I asked was whether for most a simpler, less corrected (and Olympus has gone to real extremes here, a 19 element standard prime is way beyond even Otus territory) might have been a more generally useful lens, one which would have given maybe T1.4.
That lens nearly exists. It IS the PL 25mm sans the half-stop. You feel the mZD is overly complex - I get it. I feel it is quite useful as it is. Perhaps I'm the target consumer and you are not. Perhaps Olympus should make it a point to consult you next time they design a prime then you would have nothing to complain about ;-)
As for the rest of it, now you've removed my original question from the top, it loses its context. The question I raised was 'whether for most a simpler, less corrected might have been a more generally useful lens, one which would have given maybe T1.4.

So, that question only applies to the optics. Such a lens might well have been 'rugged' and 'weather sealed' so those questions are irrelevant to the question. Nor does the alternative of using the PL 25/1.4
 
Still, the question that I asked was whether for most a simpler, less corrected (and Olympus has gone to real extremes here, a 19 element standard prime is way beyond even Otus territory) might have been a more generally useful lens, one which would have given maybe T1.4.
There is some benefit to producing halo products, demonstrations of commitment and engineering that offer both a performance and pleasure of ownership.

Not all lenses are built with the sole aim of perfect transmission.
Quite agree. And if you choose to spend your money on halo products, you have every right to do so. I'm not suggesting that Olympus doesn't have every right to market these lenses (nearly said 'make' but that wouldn't be accurate), I'm just commenting on precisely what it is you're getting for the money.
Just to be accurate, you are focusing on one aspect of the product. Precisely speaking you are getting a 25mm f1.2 lens :)
If that is your only criterion then you've clearly overspent.

Still, if you're prepared to spend money for a number on the barrel, up to you. But I'd have though the more important question is not what is that number but what the lens actually does.
 
Still, the question that I asked was whether for most a simpler, less corrected (and Olympus has gone to real extremes here, a 19 element standard prime is way beyond even Otus territory) might have been a more generally useful lens, one which would have given maybe T1.4.
There is some benefit to producing halo products, demonstrations of commitment and engineering that offer both a performance and pleasure of ownership.

Not all lenses are built with the sole aim of perfect transmission.
Quite agree. And if you choose to spend your money on halo products, you have every right to do so. I'm not suggesting that Olympus doesn't have every right to market these lenses (nearly said 'make' but that wouldn't be accurate), I'm just commenting on precisely what it is you're getting for the money.
Just to be accurate, you are focusing on one aspect of the product. Precisely speaking you are getting a 25mm f1.2 lens :)
If that is your only criterion then you've clearly overspent.

Still, if you're prepared to spend money for a number on the barrel, up to you. But I'd have though the more important question is not what is that number but what the lens actually does.
I would hope it takes pictures ;)
--
Tinkety tonk old fruit, & down with the Nazis!
Bob
 
I expect it to be excellent, but different. But, 'matching', in terms of 'quality' or 'look' are all highly subjective, IMO. What I expect, are RELATIVELY excellent results within reason (understanding the effects of the large differences between the formats we are comparing), and given the relative limitations of size and cost (in both formats).

The Zuiko's construction:

https://www.olympus.com.au/Products...ko-Digital/M-ZUIKO-PRO/17mm-F1-2-PRO/Features

Olympus' approach seems to sacrifice some capability into strong light and transmission, in order to very highly correct aberrations, etc. Based on the results from my 25/1.2, I support this approach.
It's an interesting dilemma, though. When the f/1.2 and f/1.4 are both T1.8, then all you're getting in exchange for the substantial extra size, weight and cost is slightly shallower DOF and more corrected aberrations(if indeed they are). Given the widespread views here on shallow DOF, and with it the implicit acceptance of not-very-sharp as sharp, the question is the extent that's a good trade.

--
Tinkety tonk old fruit, & down with the Nazis!
Bob
Hi Bob, I've noticed that you've mentioned the T1.8 value a lot in reference to these PRO primes.

When I look at DXOMark, I notice that the only camera that gives T1.8 for the 25/1.2 is the E-M1 II.

https://www.dxomark.com/Lenses/Olym...5mm-F12-PRO-mounted-on-Olympus-OM-D-E-M1__909

For every other body it gives T1.6, except for the GM5 which gives T1.7.

So it seems like something is fishy there. I don't know whether it is a methodology problem, or some issue with their E-M1 II specifically.

It seems that their E-M1 II gives slightly lower T-Stop ratings with several lenses.

This is, of course, a big problem, since the T-Stop is a function of the lens itself and has nothing at all to do with the sensor behind it. Obviously that sensor can have different levels of sensitivity, but that is irrelevant to the lens.

This degree of inconsistency really makes me question DXO's testing methodology, given 1/2 stop variations coming seemingly out of nowhere.

Do you have a hypothesis for the disparity in the measurements?
I was using the headline figure. I don;t think it has anything to do with DXOmark's (now a differnet outfit to DXO) testing method, it's down to the speed of the microlenses on the different sensors. Panasonic sensors have tended to have fast microlenses and can work well with faster lenses. The Sony sensors, tend to have slower microlenses, and it's quite possible that the specialised microlens layer required for PDAF makes them slower still. Thus it's likely that the E-M1 II genuinely is losing that light. It's somewhat ironic that Olympus' top flight camera can't make the most of their to flight lenses.
Nothing ironic about your assumption, it would be called unfounded. The micro lenses have nothing to do with the transmission of the lens as I can put it on my em5.2 or my em1.2. They might impact exposure, but not the lens T-stop.

The fact the EM1.2 doesnt give lower ratings with all lenses (check the 75mm f1.8, 45mm f1.8 etc) suggests it is simply sloppy data. As you are committed to accuracy in reporting, you should probably stop citing their lens figures.

--
Tinkety tonk old fruit, & down with the Nazis!
Bob
 
I expect it to be excellent, but different. But, 'matching', in terms of 'quality' or 'look' are all highly subjective, IMO. What I expect, are RELATIVELY excellent results within reason (understanding the effects of the large differences between the formats we are comparing), and given the relative limitations of size and cost (in both formats).

The Zuiko's construction:

https://www.olympus.com.au/Products...ko-Digital/M-ZUIKO-PRO/17mm-F1-2-PRO/Features

Olympus' approach seems to sacrifice some capability into strong light and transmission, in order to very highly correct aberrations, etc. Based on the results from my 25/1.2, I support this approach.
It's an interesting dilemma, though. When the f/1.2 and f/1.4 are both T1.8, then all you're getting in exchange for the substantial extra size, weight and cost is slightly shallower DOF and more corrected aberrations(if indeed they are). Given the widespread views here on shallow DOF, and with it the implicit acceptance of not-very-sharp as sharp, the question is the extent that's a good trade.
 
Still, the question that I asked was whether for most a simpler, less corrected (and Olympus has gone to real extremes here, a 19 element standard prime is way beyond even Otus territory) might have been a more generally useful lens, one which would have given maybe T1.4.
There is some benefit to producing halo products, demonstrations of commitment and engineering that offer both a performance and pleasure of ownership.

Not all lenses are built with the sole aim of perfect transmission.
Quite agree. And if you choose to spend your money on halo products, you have every right to do so. I'm not suggesting that Olympus doesn't have every right to market these lenses (nearly said 'make' but that wouldn't be accurate), I'm just commenting on precisely what it is you're getting for the money.
Just to be accurate, you are focusing on one aspect of the product. Precisely speaking you are getting a 25mm f1.2 lens :)
If that is your only criterion then you've clearly overspent.

Still, if you're prepared to spend money for a number on the barrel, up to you. But I'd have though the more important question is not what is that number but what the lens actually does.
I would hope it takes pictures ;)
You would hope.
 
I expect it to be excellent, but different. But, 'matching', in terms of 'quality' or 'look' are all highly subjective, IMO. What I expect, are RELATIVELY excellent results within reason (understanding the effects of the large differences between the formats we are comparing), and given the relative limitations of size and cost (in both formats).

The Zuiko's construction:

https://www.olympus.com.au/Products...ko-Digital/M-ZUIKO-PRO/17mm-F1-2-PRO/Features

Olympus' approach seems to sacrifice some capability into strong light and transmission, in order to very highly correct aberrations, etc. Based on the results from my 25/1.2, I support this approach.
It's an interesting dilemma, though. When the f/1.2 and f/1.4 are both T1.8, then all you're getting in exchange for the substantial extra size, weight and cost is slightly shallower DOF and more corrected aberrations(if indeed they are). Given the widespread views here on shallow DOF, and with it the implicit acceptance of not-very-sharp as sharp, the question is the extent that's a good trade.
 
I expect it to be excellent, but different. But, 'matching', in terms of 'quality' or 'look' are all highly subjective, IMO. What I expect, are RELATIVELY excellent results within reason (understanding the effects of the large differences between the formats we are comparing), and given the relative limitations of size and cost (in both formats).

The Zuiko's construction:

https://www.olympus.com.au/Products...ko-Digital/M-ZUIKO-PRO/17mm-F1-2-PRO/Features

Olympus' approach seems to sacrifice some capability into strong light and transmission, in order to very highly correct aberrations, etc. Based on the results from my 25/1.2, I support this approach.
It's an interesting dilemma, though. When the f/1.2 and f/1.4 are both T1.8, then all you're getting in exchange for the substantial extra size, weight and cost is slightly shallower DOF and more corrected aberrations(if indeed they are). Given the widespread views here on shallow DOF, and with it the implicit acceptance of not-very-sharp as sharp, the question is the extent that's a good trade.
 
I expect it to be excellent, but different. But, 'matching', in terms of 'quality' or 'look' are all highly subjective, IMO. What I expect, are RELATIVELY excellent results within reason (understanding the effects of the large differences between the formats we are comparing), and given the relative limitations of size and cost (in both formats).

The Zuiko's construction:

https://www.olympus.com.au/Products...ko-Digital/M-ZUIKO-PRO/17mm-F1-2-PRO/Features

Olympus' approach seems to sacrifice some capability into strong light and transmission, in order to very highly correct aberrations, etc. Based on the results from my 25/1.2, I support this approach.
It's an interesting dilemma, though. When the f/1.2 and f/1.4 are both T1.8, then all you're getting in exchange for the substantial extra size, weight and cost is slightly shallower DOF and more corrected aberrations(if indeed they are). Given the widespread views here on shallow DOF, and with it the implicit acceptance of not-very-sharp as sharp, the question is the extent that's a good trade.

--
Tinkety tonk old fruit, & down with the Nazis!
Bob
Hi Bob, I've noticed that you've mentioned the T1.8 value a lot in reference to these PRO primes.

When I look at DXOMark, I notice that the only camera that gives T1.8 for the 25/1.2 is the E-M1 II.

https://www.dxomark.com/Lenses/Olym...5mm-F12-PRO-mounted-on-Olympus-OM-D-E-M1__909

For every other body it gives T1.6, except for the GM5 which gives T1.7.

So it seems like something is fishy there. I don't know whether it is a methodology problem, or some issue with their E-M1 II specifically.

It seems that their E-M1 II gives slightly lower T-Stop ratings with several lenses.

This is, of course, a big problem, since the T-Stop is a function of the lens itself and has nothing at all to do with the sensor behind it. Obviously that sensor can have different levels of sensitivity, but that is irrelevant to the lens.

This degree of inconsistency really makes me question DXO's testing methodology, given 1/2 stop variations coming seemingly out of nowhere.

Do you have a hypothesis for the disparity in the measurements?
I was using the headline figure. I don;t think it has anything to do with DXOmark's (now a differnet outfit to DXO) testing method, it's down to the speed of the microlenses on the different sensors. Panasonic sensors have tended to have fast microlenses and can work well with faster lenses. The Sony sensors, tend to have slower microlenses, and it's quite possible that the specialised microlens layer required for PDAF makes them slower still. Thus it's likely that the E-M1 II genuinely is losing that light. It's somewhat ironic that Olympus' top flight camera can't make the most of their to flight lenses.
Nothing ironic about your assumption, it would be called unfounded.
Not at all.
The micro lenses have nothing to do with the transmission of the lens as I can put it on my em5.2 or my em1.2. They might impact exposure, but not the lens T-stop.
Semantically, you are right. The transmission is a property of the lens only. However, whet you're actually interested in, in a lens/camera combination is how much light gets through to the silicon, and that is a product both of the speed of the lens and the speed of the microlenses.
The fact the EM1.2 doesnt give lower ratings with all lenses (check the 75mm f1.8, 45mm f1.8 etc) suggests it is simply sloppy data.
Nothing like that.
As you are committed to accuracy in reporting, you should probably stop citing their lens figures.
You don't understand the microlens shading effect. It has been discussed at some length here some time ago. Slow microlenses don't cause a uniform loss with objective lens f-number. It prgressively shades lenses that are faster than the microlenses. So, this suggests that the E-M1 II microlenses are f/1.8 or so, so lenses faster than f/1.8 they are causing loss, slower they aren't. The slowest lens in an optical system effectively establishes the speed of the whole system.

What is ironic is, as I said, with its slow microlenses the E-M1II is the least able of Olympus' cameras to make use of Olympus' premium lenses.
Speculative as it is, that microlens explanation does make intuitive sense to me.
The microlens explanation is not speculative. It has been worked through theoretically (see here section 3) and proven in practice. It does exist and is a reasonably well-known effect. What is maybe speculative is that this is what is causing the light loss with the E-M1 II, but when you have a well stablished effect and the data fits that effect, it's not really speculation to attribute accordingly.
That's specifically what I meant, that it is speculative that the E-M1 II's discrepancies come from this effect. But I think we're in agreement overall.
That said, given the data, it doesn't seem accurate to categorically state that the f1.2 PRO lenses are T1.8 without offering caveats about specific bodies. It seems that for ~95% of M4/3 users (I have no idea what the E-M1 II's market penetration is), it is in fact a T1.6 lens.
Yes, I will agree that the headline figure of T1.8 is actually a little misleading. However, it is worth knowing that if you put it on an E-M1 II, you won't get the full light from it. I would expect that very many potential purchasers intend using it with that camera.

--
Tinkety tonk old fruit, & down with the Nazis!
Bob
 
I expect it to be excellent, but different. But, 'matching', in terms of 'quality' or 'look' are all highly subjective, IMO. What I expect, are RELATIVELY excellent results within reason (understanding the effects of the large differences between the formats we are comparing), and given the relative limitations of size and cost (in both formats).

The Zuiko's construction:

https://www.olympus.com.au/Products...ko-Digital/M-ZUIKO-PRO/17mm-F1-2-PRO/Features

Olympus' approach seems to sacrifice some capability into strong light and transmission, in order to very highly correct aberrations, etc. Based on the results from my 25/1.2, I support this approach.
It's an interesting dilemma, though. When the f/1.2 and f/1.4 are both T1.8, then all you're getting in exchange for the substantial extra size, weight and cost is slightly shallower DOF and more corrected aberrations(if indeed they are). Given the widespread views here on shallow DOF, and with it the implicit acceptance of not-very-sharp as sharp, the question is the extent that's a good trade.

--
Tinkety tonk old fruit, & down with the Nazis!
Bob
Hi Bob, I've noticed that you've mentioned the T1.8 value a lot in reference to these PRO primes.

When I look at DXOMark, I notice that the only camera that gives T1.8 for the 25/1.2 is the E-M1 II.

https://www.dxomark.com/Lenses/Olym...5mm-F12-PRO-mounted-on-Olympus-OM-D-E-M1__909

For every other body it gives T1.6, except for the GM5 which gives T1.7.

So it seems like something is fishy there. I don't know whether it is a methodology problem, or some issue with their E-M1 II specifically.

It seems that their E-M1 II gives slightly lower T-Stop ratings with several lenses.

This is, of course, a big problem, since the T-Stop is a function of the lens itself and has nothing at all to do with the sensor behind it. Obviously that sensor can have different levels of sensitivity, but that is irrelevant to the lens.

This degree of inconsistency really makes me question DXO's testing methodology, given 1/2 stop variations coming seemingly out of nowhere.

Do you have a hypothesis for the disparity in the measurements?
I was using the headline figure. I don;t think it has anything to do with DXOmark's (now a differnet outfit to DXO) testing method, it's down to the speed of the microlenses on the different sensors. Panasonic sensors have tended to have fast microlenses and can work well with faster lenses. The Sony sensors, tend to have slower microlenses, and it's quite possible that the specialised microlens layer required for PDAF makes them slower still. Thus it's likely that the E-M1 II genuinely is losing that light. It's somewhat ironic that Olympus' top flight camera can't make the most of their to flight lenses.
Nothing ironic about your assumption, it would be called unfounded.
Not at all.
The micro lenses have nothing to do with the transmission of the lens as I can put it on my em5.2 or my em1.2. They might impact exposure, but not the lens T-stop.
Semantically, you are right. The transmission is a property of the lens only. However, whet you're actually interested in, in a lens/camera combination is how much light gets through to the silicon, and that is a product both of the speed of the lens and the speed of the microlenses.
The fact the EM1.2 doesnt give lower ratings with all lenses (check the 75mm f1.8, 45mm f1.8 etc) suggests it is simply sloppy data.
Nothing like that.
As you are committed to accuracy in reporting, you should probably stop citing their lens figures.
You don't understand the microlens shading effect. It has been discussed at some length here some time ago. Slow microlenses don't cause a uniform loss with objective lens f-number. It prgressively shades lenses that are faster than the microlenses. So, this suggests that the E-M1 II microlenses are f/1.8 or so, so lenses faster than f/1.8 they are causing loss, slower they aren't. The slowest lens in an optical system effectively establishes the speed of the whole system.

What is ironic is, as I said, with its slow microlenses the E-M1II is the least able of Olympus' cameras to make use of Olympus' premium lenses.
Speculative as it is, that microlens explanation does make intuitive sense to me.
The microlens explanation is not speculative. It has been worked through theoretically (see here section 3) and proven in practice. It does exist and is a reasonably well-known effect. What is maybe speculative is that this is what is causing the light loss with the E-M1 II, but when you have a well stablished effect and the data fits that effect, it's not really speculation to attribute accordingly.
That said, given the data, it doesn't seem accurate to categorically state that the f1.2 PRO lenses are T1.8 without offering caveats about specific bodies. It seems that for ~95% of M4/3 users (I have no idea what the E-M1 II's market penetration is), it is in fact a T1.6 lens.
Yes, I will agree that the headline figure of T1.8 is actually a little misleading. However, it is worth knowing that if you put it on an E-M1 II, you won't get the full light from it. I would expect that very many potential purchasers intend using it with that camera.
Very many doesn't constitute most, nor have an effect on the lens.

So I understand and accept the potential micro lens issue, however that still only relates to a particular lens sensor combo, and therefore not the lens itself. So does that change your perception of the lens considering you have been calling it a t1.8 lens for some length of time now.
--
Tinkety tonk old fruit, & down with the Nazis!
Bob
 
Sigma doesn't have any feathers, so it's clearly way behind the times.
 
Neither of the lenses that we are talking about has 'soft edges'.

In any case, have a look at some pictures taken wide open with an f/1.2 or equivalent lens and see just how many have sharp detail in the corners. You'll find it's vanishingly small. In any case, most of the drop-off will be due to field curvature, which means that if you get the subject in the corner (in the very few cases that you do) with a focus point over it (big advantage of mirrorless, you can have focussing points in the corner) then the subject there will be in focus and sharp.
With FF f/1.2 lenses wide open, rather soft off-center. Better on APS-C in the corners. With the 25mm f/1.2 mZD, rather uniform sharpness across the frame. Obviously sharper stopped down, but one of the only f/1.2 lenses I have used with acceptable corner and edge sharpness wide open. Is your experience different? None of the 3 PL 25 copies I have owned were sharp off-center until stopped down. In comparison to the mZD 25, no contest.
The question I raised was 'whether for most a simpler, less corrected might have been a more generally useful lens, one which would have given maybe T1.4.
At what cost? If this was easy to do, why hasn't someone manufactured it?
 
There are easier ways to capture more light. We use both PL 25 and mZD 25 with our GH5's for video and the biggest benefit is not transmission differences (in post the PL sometimes requires 0.2 EV lift to match the mZD), but rather the lack of edge and corner sharpness at apertures below f/2.8 on the PL.
You must spend a lot of time shooting flat subjects, but if you do, then fine, that is your own need. I wonder in reality for how many people that is important.
Bob - For such a bright guy, you're awfully dismissive of someone's real world use cases and experience. Ego is a healthy thing, until it prevents you from learning ... TBH, I really like the other Bobn2 better, the one that is eager to learn and understand and explain. I've learned quite a few things from him, and I hope to learn more in the future.

And (not counting the fanboys/trolls), you're among friends here. Relax and discuss.
 
Not in the center does not mean in the edges. Unless you mean landscapes, for which you stop the lens down.
What would you consider the outer third of the frame right up to the edge and including corners? I'm not supposed to use that space?
You sure can, but it would be a rather strange composition, to say the list. The point of interest will stand out where in the frame it should not be. Unless you have several such points of interest scattered in the frame, but then why would it need to be wide open to begin with?

--
- sergey
 
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Not in the center does not mean in the edges. Unless you mean landscapes, for which you stop the lens down.
What would you consider the outer third of the frame right up to the edge and including corners? I'm not supposed to use that space?
You sure can, but it would be a rather strange composition, to say the list. The point of interest will stand out where in the frame it should not be. Unless you have several such points of interest scattered in the frame, but then why would it need to be wide open to begin with?
 
35mm is one of my favorite FL. I still miss my 35mm ART 1.4 on a FF body. The sharpness, 3D look and subject separation are awesome on that lens.

Do you think the Oly 17mm 1.2 will match it in terms of quality and look? I am of course not expecting 1.4 FF DOF, but otherwise do you think it would be as good as the Sigma?

--
http://www.flickr.com/photos/rjansenbr
I would expect it to "match" but as usual there will be a wide range of subjective opinions from it is "better" to those who hate it. Point is that it will be the best available and show a lot of great rendering that some may or may not see and wide open is what it is all about and there the Sigma on FF will still rule for bokeh but resolution/ detail wise wide open it would be interesting to see... hopefully someone will show us one day!

I would also like to see a Pro 25mm wide open against the undisputed best lens in the world... the Otus 50mm f1.4 as at 3 times the price of the Pro is it 3x better hahahah...
The thing is and many here seem to ignore it FF is less demanding of lenses than m43 and small and cheap { in comparison to the F/1.2 primes } FF lens on a FF camera ,will blow the the m43 offerings out of the water. The image is made up of lens plus sensor and it is system results that matter. Sony 55mm F/1.8 compared to the larger heavier and more expensive 25mm pro.

a8990ffb874140ceab7a782519737a55.jpg

9547430780af45bbac00a50eb69fdf51.jpg

As for matching the Sigma on FF not a chance. I have the Sigma 35mm F/1.4 art and use it on a 36mp Nikon and no m43 lens / camera combination can match it .

5f4d6574743a4a4788430b85fe574a4c.jpg

On a far more important note how did your op go ? I hope you are doing well

--
Jim Stirling
Thats all fine and good when you compare a 20MP camera to a 36MP+ camera. Why not pit these lenses using a Sony A7S instead? The numbers start to look closer when you get into the same MP territory. This is the reason why, when looking lens quality, using DxO isn't the best place because people come to the wrong conclusions. This is why Imaging Resource's blur units make more sense, they are as close of an objective way to look at the lens regardless of MP count on the sensor (especially since MP counts change VERY often).
The A7s I/II are the only recent gen FF 12mp cameras and are basically designed for video . The current lowest MP FF camera is the sport and speed orientated D5 where throughput is the priority . The reason I picked the GX8 and Sony A7r11 is simply because I own both cameras. If there was a higher MP count m43 camera { ideally with a much lower base ISO please } I would own it. I also use the Sigma 35mm F/1.4 on my D810
Agreed. I wish Oly and Panny would stop dragging their feet on the MP count of their sensors.
Yes, I suspect there are an awful lot more shooters interested in low ISO performance better DR, higher resolution and so on. We have an excellent selection of lenses available to us and even if we had to use very low ISO settings , the excellent IBIS could help in static subjects . For me all very high ISO settings on all formats are awful just varying degrees of awful
For your style of shooting sure. For my style of shooting high ISO is paramount. Majority of my shots are non static.
Sorry , Brian I should have specified if you are shooting in specific situations such as action in low light then you are forced to use high ISO . However I am not talking about the normal { though still too high for me :-) } 1600 or 3200 .Or when these ISO settings are used in reasonable light to give higher shutter speeds which will have less noise than murky low light . But the crazy settings like the 25600 of the E-M1 II which in true low light is horrible , it looks like a monotone pointillist painting
Totally agree.
I suspect even though circumstances may force your hand you would still try and shoot the lowest ISO possible. One need only take a glance through the likes of flickr to see other than small niche uses , such as low light sport or astrophotography low ISO shooting south of 1600 makes up the vast majority of photography
Usually when using my zooms and I start to go above my comfort level of ISO 1600 I switch to primes. I didn't have that luxury on a Reindeer Run last December 23 in Aberdeen Maryland. Run started at 8 AM. It was a dark rainy day, sunrise at 7:27 AM, had to use 14-35/2.0 which left me focally challenged at the long end. I was still at ISO 3200. If I had to go above ISO 6400 I would have been forced to go to my 25 mm/1.2.
Which would have given some advantage but not as much as you think, being a T1.8. The PL25/1.4 is also a T1.8. I suppose the issue is, had Olympus allowed it to be a little less well corrected, but not taken such a hit on the transmission, would it be a more or less useful lens.
Let me give you two more reasons why I prefer the Olympus 25/1.2 over the PL25/1.4 on my E-M1 Mk II. No purple fringing,
It must not be like the rest of the 1.2s then.
and a weather resistant lens..
Sure, if you're prepared to pay several hundred dollars, you have very right to do so.
Lot cheaper than putting than replacing a $2,000 camera using a non WR lens in the rain.
 
Still, the question that I asked was whether for most a simpler, less corrected (and Olympus has gone to real extremes here, a 19 element standard prime is way beyond even Otus territory) might have been a more generally useful lens, one which would have given maybe T1.4.
There is some benefit to producing halo products, demonstrations of commitment and engineering that offer both a performance and pleasure of ownership.

Not all lenses are built with the sole aim of perfect transmission.
Quite agree. And if you choose to spend your money on halo products, you have every right to do so. I'm not suggesting that Olympus doesn't have every right to market these lenses (nearly said 'make' but that wouldn't be accurate), I'm just commenting on precisely what it is you're getting for the money.
Just to be accurate, you are focusing on one aspect of the product. Precisely speaking you are getting a 25mm f1.2 lens :)
If that is your only criterion then you've clearly overspent.

Still, if you're prepared to spend money for a number on the barrel, up to you. But I'd have though the more important question is not what is that number but what the lens actually does.
I would hope it takes pictures ;)
Lol.
--
Tinkety tonk old fruit, & down with the Nazis!
Bob
 
There are easier ways to capture more light. We use both PL 25 and mZD 25 with our GH5's for video and the biggest benefit is not transmission differences (in post the PL sometimes requires 0.2 EV lift to match the mZD), but rather the lack of edge and corner sharpness at apertures below f/2.8 on the PL.
You must spend a lot of time shooting flat subjects, but if you do, then fine, that is your own need. I wonder in reality for how many people that is important.
Bob - For such a bright guy, you're awfully dismissive of someone's real world use cases and experience. Ego is a healthy thing, until it prevents you from learning ... TBH, I really like the other Bobn2 better, the one that is eager to learn and understand and explain. I've learned quite a few things from him, and I hope to learn more in the future.

And (not counting the fanboys/trolls), you're among friends here. Relax and discuss.
I am discussing, and I haven't dismissed anyone's real world use cases. As I said 'you must spend a lot of time shooting flat subjects, but if you do, then fine'. That is the real world use case in which you need edge to edge sharpness with shallow DOF.
 

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