veroman wrote:
>>>...I want to see a Canon crop camera that will let me shoot at f/13-16.
>>Holy crap - I didn't know those apertures were disabled.
>Diffraction, my friend, diffraction. The greater DOF at f/13/-16 is almost totally negated by the smearing at f/13-f/16. I can shoot f/13 with my 1Ds II and 5D, but not with my crops. Let me put it this way: I CAN shoot at f/13/-f/16 with my crops, but I don't want to.
To take the same picture with a crop you need a shorter focal length. A shorter focal length lens has more d.o.f.. Therefore you don't need to stop down as much to get the same d.o.f.. Therefore the diffraction limit doesn't really vary much between formats except in a purely numerical sense, and not so much in a pictorial sense. If it did vary significantly, point+shoot cameras would have settled at 2 Mpixels, or would need to use f1 lenses.