Some months ago, I accidentally dropped my Nikon 10.5mm full-frame fisheye lens. It still works OK, focuses, no scratch, etc. But I have this nagging feeling that images are slightly more blurred than they used to be.
What is the best way to check if my lens is "faulty"? Would the Nikon service center have the equipment to test that it is still within acceptable quality range (or not)? If not, is there anywhere else I could go that could do that?
Thanks in advance!