Originally posted by derekkite Norm, look at the depth of field charts. DOF doesn't change that much, but what changes is the proportion of the image that is in focus. If you have a scene where you want 2/3 of the depth in focus, yes you need to stop down on the K1, but if you want 28" in focus to isolate something, then the same aperture would give you the results you want.
My own interpretation of both the DoF charts and shooting in the field under controlled conditions with a ruler in the frame to confirm DoF would suggest different.
I'm willing to go along with the notion that the larger format might give you a slightly different image, I'm sure it does, and you might want to have both.... in any case, but I'm a little hesitant to accept your statement that DoF doesn't change much, since one of the things I did while formatting this way of presenting the data was set up a ruler beside my flower garden and take a 50mm shot and a 35mm image, one representing a D810 and one representing a K-5. The change in DoF for the same aperture was almost double for the APS-c set up. That was close to minimum focus, so maybe not as relevant further away from the camera but to just say it isn't much, well that's possibly not true.
So I already did look at the DoF charts to confirm what I posted. I'm not sure what you want me to see.
I detect you're getting at something, I'm just not sure what it is. It blows me away you guys with both formats don't have images to demonstrate what you're talking about.
I've always said, if you can't fake a stop, you're not a photographer. So a one stop difference usually makes no difference to the final image, going in one direction or the other.
The difference between APS-c and FF is a little over 1 stop or 2.25 times if you want to get all dramatic. Hence my opinion that there isn't much difference between them.
I suspect that's why there are not a lot of comparison images that even show the difference between APS-c and FF. I suspect it's really hard to tell the difference.