
Originally Posted by
Diane Miller
Robert and Jonathan, thanks for liking it! I wish more DOF was simple... If I had removed the TC I would have a focal length of 400mm instead of 560 and thus more DOF. If I stayed in the same spot, the subject would be smaller in the frame so the DOF would cover it better on two fronts. But I would have to crop a lot and I always want as many pixels on the subject as I can get.
If I moved closer so the subject was the same size in the frame as it was with the TC, the DOF would cover the subject the same as bring farther back with the 1.4. If the magnification is the same, so is the DOF.