Diffraction Limit

Started Aug 28, 2013 | Discussions thread
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In reply to Paul De Bra, Aug 28, 2013

Paul De Bra wrote:

With a sharp lens mounted on the E-M5 you can certainly see the effect of diffraction at f/8 versus e.g. f/5.6 when looking carefully at 100% pixel level on a sharp monitor. Does that qualify as noticeable?

I typically view my images on a 1920x1200 pixel 24" monitor. At that resolution and monitor size such measurable difference in sharpness is not noticeable. When I take shots with the 12-50 or 20mm there is no noticeable difference in sharpness on my monitor. When viewed at 100% there is a visible difference, and also a visible decrease in sharpness on the 20mm when going from f/5.6 to f/8. But for practical use there is no noticeable difference.

Most of the discussion about diffraction is about differences and softening that isn't really visible when admiring a photo, only when pixel-peeping.

...the effects of diffraction softening depend on the display size of the photo, the viewing distance, the visual acuity of the viewer, the other sources of blur in the photo, and the QT (quality threshold) of the viewer.

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