I am considering buying a lens whose working distance is 250(mm)-inf. I am using a set-up to acquire images, and the distance between the lens and the object is around 25 cm in this set-up. My question is that when you focus on an object that is placed a distance smaller than the Minimum Object Distance (MOD), what would be the effect on the image acquired?
The minimum focus distance — what you designate as MOD — may
be very different from a lens to another but always specify the shor-
test distance between the object and the minimum focus plane that
can be acquired and confirmed.
I said: "… may be very different from a lens to another…" but it will al-
ways result, express itself. in two non exclusive ways: shallower DoF
and micrometrical displacement values — read way less tolerance in
terms of distance to the given subject.
The most dramatic effect of shooting under that said minimum distan-
ce will be that the subject will fall out of focus very, very fast.