I manage a core facility, and am concerned that several of our oil objective lenses have become damaged. Well, they have become damaged, and I am trying to figure out if I can determine the underlying cause (damage to the front lens element, something on the back focal plane, etc).
Is there any kind of gallery of PSFs that can be related to specific damages to an objective lens? I’ve tried googling this several times, and come up with pretty much nothing.
Any advice would be much appreciated!