UV-Filters
I like the argument: why put a cheap piece of glass on a $1000-
dollar lens. It can’t help but degrade the performance. All of the
best pro photographers don’t use prophylactic filters, but I still do.
For me it is that I hate cleaning lenses or touching them at all. No
matter what you say, sooner or later dirt, dust, specks, goo is going
to get on the front of your lenses. So I still (for the most part) use
UV or clear lens filters on my expensive lenses. I know I shouldn’t,
but I do.