10-06-2011, 01:56 AM
[quote name='Klaus' timestamp='1317853784' post='12147']
The checks were done at the image center. This is hardly a valid approach to check the centering quality.[/quote]
True. But the article is not focused on centering issues (forgive the pun). Even without taking centering issues into account, there is already a measurable difference as we go from one lens copy to another, from one camera to another.
It's also why DPReview and you arrive at totally different conclusions for the same lens (e.g. Canon 100 f/2.8L IS):
From http://www.dpreview.com/lensreviews/cano.../page6.asp
"Just occasionally a lens turns up which delivers such implausibly good results in our studio tests that I have to go back and repeat everything, double checking all settings to make sure I haven't done something wrong. The Canon EF 100mm F2.8 L IS USM Macro is one example; but in this case when I repeated the tests, the results were if anything slightly better. There's little doubt that, all round, this is one of the very finest lenses we've seen - optically it's superb..."
From http://www.opticallimits.com/canon_eos_f...5d?start=1
"The resolution characteristic of the Canon L lens is very good although it did fall a little short of the high expectations that we had here."
The checks were done at the image center. This is hardly a valid approach to check the centering quality.[/quote]
True. But the article is not focused on centering issues (forgive the pun). Even without taking centering issues into account, there is already a measurable difference as we go from one lens copy to another, from one camera to another.
It's also why DPReview and you arrive at totally different conclusions for the same lens (e.g. Canon 100 f/2.8L IS):
From http://www.dpreview.com/lensreviews/cano.../page6.asp
"Just occasionally a lens turns up which delivers such implausibly good results in our studio tests that I have to go back and repeat everything, double checking all settings to make sure I haven't done something wrong. The Canon EF 100mm F2.8 L IS USM Macro is one example; but in this case when I repeated the tests, the results were if anything slightly better. There's little doubt that, all round, this is one of the very finest lenses we've seen - optically it's superb..."
From http://www.opticallimits.com/canon_eos_f...5d?start=1
"The resolution characteristic of the Canon L lens is very good although it did fall a little short of the high expectations that we had here."