04-25-2011, 12:43 AM
[quote name='popo' timestamp='1303634001' post='7878']
Just quickly skimming various reviews here for Canon APS-C, fast primes seem to peak around f/4. The 85/1.2 is the only one I've found so far that has a relatively good performance at f/2.8, but even then it is only comparable to f/4 not better. It is curious that full frame centre results also peak around f/4, but border performance seems to lag a stop or two behind.
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That's actually inherent to lens design limitations... <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
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And this has become clear again with 14+ MP APS-C cameras, and 17+ MP FF cameras. The artificial cut-off in resolution plays much less of a factor with the generations of cameras which have such high resolution sensors.
Kind regards, Wim
Just quickly skimming various reviews here for Canon APS-C, fast primes seem to peak around f/4. The 85/1.2 is the only one I've found so far that has a relatively good performance at f/2.8, but even then it is only comparable to f/4 not better. It is curious that full frame centre results also peak around f/4, but border performance seems to lag a stop or two behind.
[/quote]
That's actually inherent to lens design limitations... <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />And this has become clear again with 14+ MP APS-C cameras, and 17+ MP FF cameras. The artificial cut-off in resolution plays much less of a factor with the generations of cameras which have such high resolution sensors.
Kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....