Depth of field (DOF) depends on lens focal distance, lens aperture and distance. If I want to take a picture of a given object, for a given framing and lens aperture (f), the shorter the focal distance of the lens, the biggest the DOF, and the biggest the distance to the object the biggest also the DOF.
However, focal distance goes against distance to object (for a given framing). If I use a short focal lens (this is good for DOF) I will have to reduce the distance to the object (and this is bad for DOF) to keep the desired framing. My question is, to have the maximum DOF, what is better: to use long focal lenses (and increase distance to object) or to use short focal ones (and reduce distance to object) ?
Thanks for your help