JensR

Lives in United Kingdom Bath, United Kingdom
Works as a Mechanical Engineer
Joined on Nov 23, 2003
About me:

Hi,

thanks for stopping by!
If you want to see what I'm up to, send me a message :)

My 'plan':
Talk Pentax into a digital Electro-Spotmatic! (This needs some work...)

-------------

Older Signatures:

'LBA knows no bounds, and seeks no justification...' (Jim King, 2005)
http://www.jr-worldwi.de/photo/index.html - Photography, Tech and Geek stuff :}

'Why is everyone answering rhetorical questions?' (Me, 2005)

'Well, 'Zooming with your feet' is usually a stupid thing as zoom rings are designed for hands.' (Me, 2006)

'I only trust those photos I have faked myself.' (Me, 2007)
http://www.jensroesner.de/

--=! Condemning proprietary batteries since 1976 !=--

'I don't want them to believe me, I just want them to think.'
Marshall McLuhan

Comments

Total: 135, showing: 21 – 40
« First‹ Previous12345Next ›Last »
In reply to:

upptick: So, the main reason I believe there is a God is because humans are able to devise machines and instruments that are far, FAR more complicated than what would be needed for mere survival --- Darwin would say that there is simply no selective / competitive pressure and therefore no survival advantage to create anything nearly as complicated as this Sony lens. Yet, here it is. What an exquisite beauty!

Evolution is not about "merely surviving". Evolution is the continuous change of species. The "better" individuals of each species have a better chance of survival and passing on their "better" genes. This means that effectively each species competes with others. A certain level that is "merely surviving" at one point would mean "becoming extinct" a thousand or a million years later because the competition has gotten better. Therefore continuous change, adaptation and improvement, an eternal trade-off between specialisation and flexibility is at the very heart of evolution.
Now, we can discuss how or why our conscious perpetual developments from taming fire to the moon landings mirror the unconscious perpetual developments by evolution, but I don't think we need to invoke any creator for that either.

Link | Posted on Feb 25, 2017 at 17:03 UTC
On article CP+ 2017: Hands-on with new Voigtländer E-mount primes (117 comments in total)
In reply to:

Becksvart: That macro looks interesting and I for one wouldn't use it for portraits.

I wonder if people will target it with the same comment as the Samyang macro : 'auto aperture is a boon for macro photographers', which is a statement with some merit.

The 40 1,2 too, of course we want f/1,2 : )

Philipreeve's tests will be interesting to read too since he will likely compare it to both (other) modern FE lenses and much cheaper legacy options.

Background sharpness? When doing macro, my background is never "sharp", so I do not understand your question.

Focus shift during stopping down has been a non-issue with any lens I have used for macro stuff. I've heard that one of the bright Samyang lenses shows a lot of it, never heard a macro lens exhibiting this issue. What (macro?) lens are you using that this is a problem?

Link | Posted on Feb 24, 2017 at 19:39 UTC
On article CP+ 2017: Hands-on with new Voigtländer E-mount primes (117 comments in total)
In reply to:

Becksvart: That macro looks interesting and I for one wouldn't use it for portraits.

I wonder if people will target it with the same comment as the Samyang macro : 'auto aperture is a boon for macro photographers', which is a statement with some merit.

The 40 1,2 too, of course we want f/1,2 : )

Philipreeve's tests will be interesting to read too since he will likely compare it to both (other) modern FE lenses and much cheaper legacy options.

I disagree, Magnar. In my experience, seeing the real DOF in the viewfinder is not an advantage for macro focusing. It is far easier to see the focus plane if it is narrow. Brightness is not the real concern, it is that you cannot judge the plane of focus on a small screen or small viewfinder adequately. You'll need to zoom in on the screen. And when you do that, the zoomed in wide open view will be easier to focus than the zoomed in stopped down view.

Link | Posted on Feb 24, 2017 at 14:26 UTC
On article CP+ 2017: Hands-on with new Voigtländer E-mount primes (117 comments in total)
In reply to:

chetan crasta: Aren't all these lenses lacking autofocus? Why isn't such an important point mentioned here?

You mean like in the very first sentence?
"Voigtländer announced three new manual focus lenses at this year's CP+ show"

Link | Posted on Feb 24, 2017 at 14:16 UTC
On article Leica SL Review (1089 comments in total)

"Let's take a look at how the SL compares with the Sony a7R II, the only other full frame mirrorless camera out there currently."

Well, as far as I know: A7, A7S, A7R, A7 II, A7S II, A7R II

Also might be worth pointing out that all Mark2 Sonys offer stabilised lenses as well.

Choosing the 24MP A7 II for comparison would probably have helped to close the speed difference between Sony and Leica. Comparing it to the Mark I (no IBIS) would illustrate the price differential.

Link | Posted on Feb 22, 2017 at 15:58 UTC as 181st comment | 13 replies
On article Yongnuo YN 85mm F1.8 lens now available (251 comments in total)
In reply to:

TerrificShot Photography: At this price, this is not a surprise. A while ago, I ordered the Yongnuo 35 mn lens because it was the only cheap alternative to the Canon 35mn. I was simply disappointed by the same issue as this new lens : blurry corners, noisy autofocus

--------
Best,
Herve
http://www.terrificshot.com/blog

If you don't believe that compromises have value, you are wrong. Basically everything in life is a compromise. Your Sigma lens is a compromise. When Sigma designed it, they weighed the pros and cons of each of their decision and settled for the best compromise. And when you picked the lens, you weighed pros and cons (hopefully) and made your decision. The skill is to find the right compromise. Posts like yours show a misunderstanding of logic and reality.

Your argument that "if photographers were compromisers, they would all shoot with a cellphone" is just fallacious. Choosing the right compromise is NOT the same thing as choosing the bad option.

Where has our society gone wrong if people expect a thing to only have advantages? Where have we gone wrong if the right compromise is deemed a failure?

Link | Posted on Feb 22, 2017 at 15:43 UTC
On article Sigma Announces 100-400mm F5-6.3 DG OS HSM lens (154 comments in total)
In reply to:

EXX: Why Sigma does not make a Sony A-mount and Pentax K-mount version of this (and some other recent ART lenses) is beyond me.

The flange focal distance of Sony A-mount and Pentax K-mount are shorter than the Nikon F-mount, so it is just a question of extending the lens size a little bit, together with the appropriate bayonet for the specific mount. No change in optical lens design required.

For Sony A-mount users, this lens would be a great modern alternative to the old Minolta AF 100-400mm F4.5-6.7 APO.

MShot - I am not familiar with the µ43 world, but an adapter like the Metabones or MC11 could be a great solution.

Link | Posted on Feb 22, 2017 at 05:48 UTC
On article Sigma Announces 100-400mm F5-6.3 DG OS HSM lens (154 comments in total)
In reply to:

EXX: Why Sigma does not make a Sony A-mount and Pentax K-mount version of this (and some other recent ART lenses) is beyond me.

The flange focal distance of Sony A-mount and Pentax K-mount are shorter than the Nikon F-mount, so it is just a question of extending the lens size a little bit, together with the appropriate bayonet for the specific mount. No change in optical lens design required.

For Sony A-mount users, this lens would be a great modern alternative to the old Minolta AF 100-400mm F4.5-6.7 APO.

Market share alone is only part of the equation. Cost of adaptation is another one. If it were just market share, Sigma would produce no Sigma-mount lenses. The other part of the equation is competition. There is a lot of competition on Canon and Nikon mounts, but Sigma would be the only third-party manufacturer of modern AF lenses for Pentax, so would have a higher proportion of that market share.
Obviously they have counted their beans and decided against supporting the fastest-growing dSLR company...

Link | Posted on Feb 21, 2017 at 13:37 UTC
On article Sigma Announces 100-400mm F5-6.3 DG OS HSM lens (154 comments in total)
In reply to:

EXX: Why Sigma does not make a Sony A-mount and Pentax K-mount version of this (and some other recent ART lenses) is beyond me.

The flange focal distance of Sony A-mount and Pentax K-mount are shorter than the Nikon F-mount, so it is just a question of extending the lens size a little bit, together with the appropriate bayonet for the specific mount. No change in optical lens design required.

For Sony A-mount users, this lens would be a great modern alternative to the old Minolta AF 100-400mm F4.5-6.7 APO.

Pentax KAF4 would be a good idea and should be easy-ish do to as it is an electronic-only mount, but only IF they have reverse-engineered the KAF4 protocol. This is a full-frame lens, so would be a neat compact solution for K-1 owners. Would also work well on the whole range of recent Pentax APS-C bodies. Very disappointing.

Link | Posted on Feb 21, 2017 at 11:45 UTC
On article Yongnuo YN 85mm F1.8 lens now available (251 comments in total)
In reply to:

TerrificShot Photography: At this price, this is not a surprise. A while ago, I ordered the Yongnuo 35 mn lens because it was the only cheap alternative to the Canon 35mn. I was simply disappointed by the same issue as this new lens : blurry corners, noisy autofocus

--------
Best,
Herve
http://www.terrificshot.com/blog

Mark, I think you've made up your mind. Never mind that most reports of the 35mm's performance indicate that it is good value for money. No, it is not a "great lens full stop", and there is sample variation, but it seems good value for money. If that is "crappy" to you, then so be it.

If you can't tell the difference between a duck and a seagull, maybe you shouldn't do lens reviews...

Link | Posted on Feb 21, 2017 at 11:38 UTC
On article Yongnuo YN 85mm F1.8 lens now available (251 comments in total)
In reply to:

drdocmatt: No-one seems to have noticed that Canon owns Yongnuo ..

You mean the 2015 April Fool's joke?
https://fstoplounge.com/2015/04/canon-buy-knock-off-brand-yongnuo/

Link | Posted on Feb 21, 2017 at 11:26 UTC
On article Yongnuo YN 85mm F1.8 lens now available (251 comments in total)
In reply to:

tkbslc: Yongnuo is having a lot of fun with Canon's expired patents.

At minimum? And then you give one reason that isn't even a reason: Do you understand that lens styling and lens optical design have no direct relationship? This lens's plastic housing looks the Canon, but that has nothing to say about the innards.
And it is unlikely that the styling is protected by a patent. Patents don't usually cover stuff like this. However, styling can be protected via trademark, which does not run out after a certain time. So that would not support your claim either.

How would you have proof? Dunno, maybe post the patent for us. You know, it's publically available and then we can discuss. You shouldn't make baseless claims such as this.

Link | Posted on Feb 19, 2017 at 05:01 UTC
On article Yongnuo YN 85mm F1.8 lens now available (251 comments in total)
In reply to:

TerrificShot Photography: At this price, this is not a surprise. A while ago, I ordered the Yongnuo 35 mn lens because it was the only cheap alternative to the Canon 35mn. I was simply disappointed by the same issue as this new lens : blurry corners, noisy autofocus

--------
Best,
Herve
http://www.terrificshot.com/blog

Mark, this lens is an 85/1.8 - so it does have a rather large aperture. On which sample photos do you base your assessment of the sharpness? (Also, there are other reasons to buy primes, but that's another story.)

Link | Posted on Feb 19, 2017 at 04:50 UTC
On article Yongnuo YN 85mm F1.8 lens now available (251 comments in total)
In reply to:

tkbslc: Yongnuo is having a lot of fun with Canon's expired patents.

So to recap, you have absolutely no proof and are just repeating hearsay and uninformed rumours.

Link | Posted on Feb 19, 2017 at 04:43 UTC
On article Yongnuo YN 85mm F1.8 lens now available (251 comments in total)
In reply to:

tkbslc: Yongnuo is having a lot of fun with Canon's expired patents.

Which Canon patent are they using?
If you mean the normal Canon 85/1.8, then the optical arrangement is different: 9 Elements in 7 groups for the Canon, 9 elements in 6 groups for the Yongnuo.
It's not impossible that there is an old Canon patent that Canon never used, but how likely is that? So, could you provide a link that proves that either the optical formula stated is a lie or that they have used another patent?

Link | Posted on Feb 19, 2017 at 03:05 UTC
On article Yongnuo YN 85mm F1.8 lens now available (251 comments in total)
In reply to:

TerrificShot Photography: At this price, this is not a surprise. A while ago, I ordered the Yongnuo 35 mn lens because it was the only cheap alternative to the Canon 35mn. I was simply disappointed by the same issue as this new lens : blurry corners, noisy autofocus

--------
Best,
Herve
http://www.terrificshot.com/blog

These are not counterfeit lenses. counterfeit: "made in exact imitation of something valuable with the intention to deceive or defraud". These clearly do not say Canon anywhere. And the optical arrangement is different, too (9 Elements in 7 groups for the Canon, 9 elements in 6 groups for the Yongnuo). They do use a similar cheap plastic styling as Canon. But that's not "counterfeit".

Link | Posted on Feb 19, 2017 at 03:01 UTC
On article Action-packed: Sony a6500 review (1156 comments in total)
In reply to:

bowserb: I have no concern about 4k video. However, this camera's in-body stabilization that works with or without in-lens stabilization, is why I cancelled my pre order for the Canon M5. Now, if someone can just make a reliable, fully functional EF/EFS to Sony E adapter, this is my new camera.

Sorry for the late reply. This is very encouraging to hear, thank you!

Link | Posted on Feb 13, 2017 at 09:43 UTC
On article Action-packed: Sony a6500 review (1156 comments in total)
In reply to:

bowserb: I have no concern about 4k video. However, this camera's in-body stabilization that works with or without in-lens stabilization, is why I cancelled my pre order for the Canon M5. Now, if someone can just make a reliable, fully functional EF/EFS to Sony E adapter, this is my new camera.

Brechtlam, if you were to rank the MC11 performance for Sigma, Canon and Tamron/Tokina lenses, would there be a stark difference and how would they stack up?

Link | Posted on Feb 7, 2017 at 04:23 UTC
On article Sigma 85mm F1.4 Art DxO results: a new king is crowned (249 comments in total)
In reply to:

falconeyes: Bokeh set aside, this is the first 1:1 MTF comparison of Sigma 85/1.4A vs. Nikon 105/1.4E
-> https://www.dpreview.com/reviews/lens-compare-fullscreen?compare=true&lensId=sigma_85_1p4_dg_hsm_a&cameraId=nikon_d810&version=0&fl=85&av=1.4&view=mtf-ca&lensId2=nikon_105_1p4_e_ed&cameraId2=nikon_d810&version2=0&fl2=105&av2=1.4

The figures for the 105/1.4E have been stunning, but the 85/1.4A is almost a new all time record (it just failed to beat the Otus 55/1.4).

Unfortunately, both the 85 and 105 have shorter focal lenghts than claimed: 80mm and 95mm. I.e., there relative difference in focal length is closer to the claim: 19% rather than 24% difference.

Sorry, I was on mobile and could not do a proper investigation regarding infinite focus. I do notice that this is something many less-expert testers do not consider, but as several of you have pointed out, DXO does.

Link | Posted on Feb 3, 2017 at 17:34 UTC
On article Sigma 85mm F1.4 Art DxO results: a new king is crowned (249 comments in total)
In reply to:

Fred Joseph: Measured focal length of 79.7mm???? What does that mean? Is the lens short-changing the owner by 5mm?

I was wrongly hopeful: As FalconEyes discussed below, they test the lens at infinity.
You gotta appreciate Pentax calling their 77 a 77, their 43 a 43 and their 31 a 31. It even became became a trademark of sorts.

Link | Posted on Feb 3, 2017 at 17:33 UTC
Total: 135, showing: 21 – 40
« First‹ Previous12345Next ›Last »