It's probably a good thing that I don't fly with my Nikon 500 mm f4 AFS lens. You can't put a filter on the front of that big monster... 122 mm in diameter... but it does have a protective element in front of the first lens element. Probably a good thing I don't fly with it, because some callous moron would end up with a broken finger for leaving a print on the front of that puppy!!!!

Gary