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Message: <blockquote data-quote="dslater" data-source="post: 362998" data-attributes="member: 32537">Too true - diffraction is an optical property and has little or nothing to do with the pixels. However, since the advent of digital cameras, many more people are concerned with diffraction mainly due to pixel-peeping. Back in the days of film, people rarely enlarged images to the degree that a 100% pixel-peep represents. As a result, diffraction effects were harder to see, and there was less concern with them.As far as lens focal length - it doesn't figure into the diffraction calculation - diffraction depends only on f-value and wavelength of light. i.e. a 20mm lens at f/22 has the same sized airy disk as a 300mm lens at f/22.<a href="http://en.wikipedia.org/wiki/Airy_disk#Cameras" target="_blank">Airy disk - Wikipedia, the free encyclopedia</a></blockquote>