[quote name='mst' timestamp='1290075916' post='4236']
No. You can not conclude, and they are not comparable.
[/quote]
This seems to contradict previous statements. Photozone always said that the lens data IS comparable in respect of the same lens mount system. Consequently, if you know how (i) Canon lens A performs in relation to Canon lens B, (ii) Olympus lens A performs in relation to Olympus lens B, and (iii) Canon lens A performs in relation to Olympus lens A, then you can also conclude how Canon lens B will perform in relation to Olympus lens B. As already mentioned, I am not talking about corner performance.
Pratical conclusion: I already agreed that this test would be rather academic and would probably not result in a lot of revenues/clicks. It would only answer the frequently posed question whether Canon glass is clearly inferior to Nikon or Olympus glass (or vice versa). I doubt that there are huge differences.
[quote name='Tiz' timestamp='1290078218' post='4240']
This seems to contradict previous statements. Photozone always said that the lens data IS comparable in respect of the same lens mount system. Consequently, if you know how (i) Canon lens A performs in relation to Canon lens B, (ii) Olympus lens A performs in relation to Olympus lens B, and (iii) Canon lens A performs in relation to Olympus lens A, then you can also conclude how Canon lens B will perform in relation to Olympus lens B. As already mentioned, I am not talking about corner performance.
Pratical conclusion: I already agreed that this test would be rather academic and would probably not result in a lot of revenues/clicks. It would only answer the frequently posed question whether Canon glass is clearly inferior to Nikon or Olympus glass (or vice versa). I doubt that there are huge differences.
[/quote]
No, they are only comparable with the same test system.
A system is a combination of a specific DSLR + Post-Processing.
We never stated something else - see the Lens Test FAQ.
This is, BTW, true for all lens testing websites including the big one.
Some do still attempt to allow comparisons but this is technically invalid.
[quote name='Klaus' timestamp='1290078378' post='4241']
No, they are only comparable with the same test system.
A system is a combination of a specific DSLR + Post-Processing.
We never stated something else - see the Lens Test FAQ.
[/quote]
I agree and I did not intend to say anything to the contrary when I used the words "lens mount system". On the other hand, I believe that you made the experience that previously tested, "bad" Canon lenses with weak corners performed even worse when repeatedly tested on a newer sensor with a higher pixel-density (i.e., the results were no big surprise or something like that).
As a long time (well since 2007 anyway) user of the data from this site, and a long time Canon equipment owner, I would say the main (99%) use cases are covered here.
Main use Case: Canon and Nikon body owners looking to purchase Canon and Nikon lenses.
Hence, the emphasis on manufacturers lenses, by this site, is absolutely appropriate. Most long time Canon owners, like me, have at least one non-functional, expensive, 3rd party lens, that completely cured us of wanting to buy one, forever.
For example, in 1997, I purchased and "APO" version of a 3rd party lens, 70-300, size of a brick, cost of a small car.
It does not work on any digital Canon SLR. Not at all. Unlike ALL of my Canon EF lenses.
Hence, this site, with its comprehensive listing of manufacturer lenses, is my, and most, main use case.
Keep up the extraordinarily good work gentlemen. We (the mean user) really appreciate it.
[quote name='jsanch08' timestamp='1290079810' post='4244']
As a long time (well since 2007 anyway) user of the data from this site, and a long time Canon equipment owner, I would say the main (99%) use cases are covered here.
Main use Case: Canon and Nikon body owners looking to purchase Canon and Nikon lenses.
Hence, the emphasis on manufacturers lenses, by this site, is absolutely appropriate. Most long time Canon owners, like me, have at least one non-functional, expensive, 3rd party lens, that completely cured us of wanting to buy one, forever.
For example, in 1997, I purchased and "APO" version of a 3rd party lens, 70-300, size of a brick, cost of a small car.
It does not work on any digital Canon SLR. Not at all. Unlike ALL of my Canon EF lenses.
Hence, this site, with its comprehensive listing of manufacturer lenses, is my, and most, main use case.
Keep up the extraordinarily good work gentlemen. We (the mean user) really appreciate it.
[/quote]
This site is about objective testing. As such, there is no room for brand name bias - and I think 3rd parties deserve proper consideration. It appears the site owners share this sentiment.
To view this site as "primarily" about manufacturer lenses ignores the changes that have occurred in the industry since 1997 when you bought that lens (13 years ago!). Sigma, Tamron, and Samyang have shown that third parties are capable of producing excellent lenses that are on par with manufacturer lenses. See the Sigma 8-16mm, Sigma 50mm, or Samyang 14mm for examples.
in short, please check your biases at the door. only results matter
I do welcome 3rd party lenses where they either provide something better than the original, or do a good enough job for much less cost. But 3rd party compatibility remains a potential concern.
Recently it came to light that various Tamron lenses wont function fully with the outer cross type AF points on mid range Canon bodies as it appears they used the same lens ID as ancient Canon lenses which also do the same. And on Sigma, their lenses have trouble with the Sony Axx range unless updated. Credit to Sigma for offering a free update, but you have to worry which lenses are supported, and for how long?
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.
[quote name='popo' timestamp='1290247064' post='4277']
I do welcome 3rd party lenses where they either provide something better than the original, or do a good enough job for much less cost. But 3rd party compatibility remains a potential concern.
Recently it came to light that various [url="http://www.canonrumors.com/2010/11/tamron-lens-phenomenon-update/"]Tamron lenses wont function fully with the outer cross type AF points on mid range Canon bodies[/url] as it appears they used the same lens ID as ancient Canon lenses which also do the same. And on Sigma, their lenses have [url="http://www.sigma-photo.co.jp/english/news/info_100910.htm"]trouble with the Sony Axx range[/url] unless updated. Credit to Sigma for offering a free update, but you have to worry which lenses are supported, and for how long?
[/quote]
Old mounts ...
Sony E and MFT allow lens firmware updates by users.
[quote name='Klaus' timestamp='1290078378' post='4241']
This is, BTW, true for all lens testing websites including the big one.
[/quote]
The big one? I always thought of this one here as the big lens test site. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='  ' />
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