Quote Originally Posted by neuroanatomist
At a given subject distance (assuming two lenses have similar MFDs for 1:1), the shorter focal length will result in deeper DoF. However, that's offset by the crop factor. The common wisdom that a crop sensor has deeper DoF is based on subject distance - to get the same framing, you're further away with a crop sensor, and the increased distance is what yields the deeper DoF. But at 1:1 (or for any fixed mag), subject distance is the same for APS-C vs. FF (the FoV is just smaller with crop). At a fixed distance, a crop sensor actually produces a *shallower* DoF for a given focal length.

John


There are several ways to look at it, all of which are correct. I am not sure that any senario would give an advantage.


I think the bettercontrast out of the 5D IItrumps the crop bodies for macro.Thatmay not be true with the 1D IV, sometimes it seems to give better contrast than I get out of the 5D II. I may try it on my next outing for macro. Who knows,with its superior AF system I may be able to shoot some Bee's in Flight like Denisehas lately.