the difference in aperture discussion is often misleading. Really, it's a difference in your framing and distance to subject.
With a crop camera, let's say that you're shooting a head and shoulders portrait of a subject from 4ft away. To get the same framing with a full frame camera, you'll be closer to your subject. Closer to subject = shallower DOF. It's really that simple...
Take for example a series of shots I did while looking at the differences in ISO performance between my 7D and 5D3. In both pictures, the camera settings were the same, the tripod was in the same place. Look at the difference in framing:
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5D MK III ISO 100
by
Trovatoam
, on Flickr
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7D ISO 100
by
Trovatoam
, on Flickr
Again, both shots were from the same distance from the bottles, so on these, the DOF is the same. However, to get the same framing on the 7D shot, I would have to move the tripod back, which would result in a larger DOF.
Canon 5dmkIII, Sigma 15mm f/2.8FE; 35mm f/1.4; Canon EF70-200 f/2.8L IS II; --- YN560 x 7
I'm not a professional photographer, and I don't want to be.
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