Here are links to three excellent articles that support Jason's assertion regarding diffraction limits with respect to sensor size:LENS DIFFRACTION & PHOTOGRAPHYhttp://www.cambridgeincolour.com/tutorials/diffraction-photography.htmDIGITAL CAMERA DIFFRACTION, PART 2http://www.cambridgeincolour.com/tutorials/diffraction-photography-2.htmDIGITAL CAMERA SENSOR SIZEShttp://www.cambridgeincolour.com/tutorials/digital-camera-sensor-size.htmSince larger sensor sizes can use smaller apertures before the effects of diffraction are noticeable, it appears the answer in some cases is "it depends."Ralph
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