Hello there, So I made the decision, and my next lens is going to be: Nikkor 85mm f/1.4 Right now I have never used any filter or protection on my lenses. When I first got my camera I looked into it, and I found that having an extra element on the glass could take away from the IQ. Thus I never thought it was a good idea to spend a lot of money on glass to just ruin it by putting a filter on. However, now that I am about to drop $1200 on the 85 1.4, I am reconsidering my options. 1.) Do you personally use filters or protectors on your lenses? 1a.) Have you noticed any difference in image quality? 2.) Are there reasons why NOT to use these protectors? BTW, i'm only talking about top of the line here. If I do get one, i'll be getting the Nikon version.