n1as wrote in post #15595460
To get the same field of view, the crop-sensor camera needs to shoot with a shorter lens. The shorter lens yield wider DOF. Is that why the crop-sensor gives more DOF?
Yes, this is the complete, total answer. And this answer isn't limted to just 1.6X and FF...it spans everything from tiny sensor P&S cameras to medium format digital. The larger the format, the longer the focal length you need to take the same picture.
This move to longer focal lengths with larger formats is entirely why larger formats give less DOF.
If you shoot with the same lens on both cameras (same scene, same shooting position, same f/stop) and then crop the FF image to equal the FoV of the 1.6 crop-factor sensor will you have the same DOF?
Yes. Cropping a larger format to be the same as a smaller format then makes the two cameras the same. The only difference you might have here is a different number of pixels (depending on what specific cameras you are talking about).