If your purpose is to protect the lens from scratches, the UV filter is what you want.
My lens chart shows that the 18-135 lens has a filter attachment size of 67mm.
OKay, I have a Nikon D80 with the 18-135mm lens. I was speaking to a friend that knows more about photography then me, however he does not use digital, and he was telling me I need a lens filter for my camera. Doing some research, I found several different lense filters. I am leaving in 2 days for Mexico and would like to get a lens filter, if for nothing else to protect my lense as I was told. What is a good basic lens filter? UV? Haze? 81A?
I do plan on doing more research and getting a lens filter kit from BH or another company, but I need something for my trip.