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Old Posted Nov 20, 2009, 11:08 PM
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Doady Doady is offline
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Quote:
Originally Posted by toyota74 View Post
one more thing to do with fstops in apeture....will an increase in say fstop 11 to 22 slightly decrease image quailty..thought I
saw this on a site but couldnt find it again and its bugging me
I think mentioned this right in this thread, didn't I? I think if you look int his thread you can find it somewhere. Maybe this is where you heard it.

Basically every lens has a limit to how far you can decrease F-stop before loss of sharpness due to diffraction starts:

my Olympus C-7070 - F4.0

Four-Thirds / Micro Four-Thirds - F8.0

APS-C (eg. Canon EF-S) - F11

35mm / Full Frame - F16

Not exact numbers but you get the idea. Remember diffraction depends on the lens, not the body and sensor size. That chart i_am_hydrogen posted is most likely for 35mm/full frame, as you can see loss of sharpness starts past F16.
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