I just got the Canon EF 100mm f/2.8 Macro USM and I really want to put a UV filter on the lens to protect the front element, but I feel uneasy screwing one on because of the curved front element. I feel that if I screw in the filter all the way, the front element will rub against the filter and will scratch or at the very least put unecessary pressure on the glass.
The filter I have is Tiffen 58mm that I used previously with my kit lens.
I tried to put a small piece of tissue in the center of the filter and then screwed it on and it seems that the tissue is getting depressed :S I really want to love this lens, but why couldnt they just make the filter thread sticking out further?
Has anyone else experienced issues with filters for this lens?
What about ultra thin filters? Would that help anyway or do they have the same thread depth? Never used one before.