I thought it was pretty well accepted that you get aperture
diffraction in 35 mm film cameras by F16. You can see it in the
results in almost all lens tests. A quick review of Gary Reese's OM
lens tests on a film camera certainly reflects that. Why it would
disappear in the full frame lens you are using on your 5D is puzzling.
Winsor
Long Beach, California, USA
On Mar 19, 2007, at 4:08 AM, Chuck Norcutt wrote:
>>
>> My conclusion is that anything down to f22 on the 5D is unaffected in
>> any practical way by pixel diffusion. F32 clearly loses sharpness.
>> This
>> test does not, however prove that that is only from pixel
>> diffraction,
>> it could also be due in some part to ordinary aperture diffraction. I
>> know that the 135/4.5 macro lens has noticeably decreased
>> sharpness on
>> film at f45 and wouldn't be surprised if a test like this showed some
>> effect at f32 as well.
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