So I just got a Nikon Nikkor 50mm f/1.4D AF Lens, and this is my first real one (except a used one that I got for free) other than the stock 18 - 55mm one that came with the camera. I'd like to protect this lens as best as I can, so I want to get a filter for it. I happen to have Best Buy gift cards, and they have RocketFish filters there, but are those actually any good? I know that filters aren't too expensive, so I don't HAVE to use my gift cards. Just wondering what everyone else uses, that would provide the least amount of "interference" when shooting.