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Forum: Pentax SLR Lens Discussion
11-03-2015, 08:31 AM
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when you do I'd love to see it.
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Forum: Pentax SLR Lens Discussion
11-03-2015, 06:44 AM
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I have and it doesn't suck depending on what your subject is.
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Forum: Pentax SLR Lens Discussion
11-02-2015, 05:57 PM
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This ignores the fact that sensor pixel pitch is what causes this. If you have a super resolution FF it will show diffraction sooner than a low res FF. And a low res APSC will not show diffraction as soon as a high res one. So a K100D will be able to use higher f/stops than a K3... .
Don't take my word... read this:
Diffraction Limited Photography: Pixel Size, Aperture and Airy Disks |
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Forum: Pentax SLR Lens Discussion
11-02-2015, 03:54 PM
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Also one thing that bugs me. With the FA lenses - we get MTF data but it's geared to film era cameras right? So diffraction is likely not a consideration for the MTF program line. I don't know if any lenses would have an MTF pushing the aperture too small for a given sensor's pixel pitch but I suppose it is possible.
As I pointed out earlier - you can get by with more than what the math may suggest since it really only applies to visual observation and unless you print large and stick your nose up against the frame it's hard to see early onset diffraction.
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Forum: Pentax SLR Lens Discussion
11-02-2015, 03:49 PM
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And let's not forgot diffraction is also defined by where you start to see it - so unless you print very large and view from very close, the practical limits are higher than the simple math and the pixel peepers may suggest.
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Forum: Pentax SLR Lens Discussion
11-02-2015, 01:30 PM
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Only for FA and newer lenses...
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