Dont use any filter, problem solved.
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Even if I had the money for a 200mm f/2 L, I don't think I would get one because I'd be paranoid about damaging it.
One issue besides mounting via an adapter is AF lock/confirmation
I can understand avoiding a car or a floor number with the number 4 in it, because plenty of people are killed in cars and buildings. But when was the last time someone was killed by a camera?
Help me understand the need of F2.8 in such a lens.
I would think, that at 10mm, this lens will be mostly used as a landscape/architecture photography tool, and for that you will need the biggest DOF. Of course, at 10mm even 2.8mm will you give great DOF, but i will doubt that anyone will use it due to softness.
So why is it F2.8? so you could handhold shoot at night some buildings? (Most would still use tripod and bigger F stop anyway)