Lens Filter Cap

Lens Filter Cap
How I can put in a UV filter on my Canon Slr Camera?

I took the lens cap off, then put the filter .. is on but can still spinning round and round filter (not out) … is this supposed to happen?? I'll take anything else besides the lens cap before I fit in the filter?

A regular UV filter does not revolve around once it is final. But maybe you really have a polarizing filter instead – those DO NOT twist. You can start by reading about them here http://en.wikipedia.org/wiki/Photographic_filter, keep google if you want more details.

Sanyo AMF Active Maintenance Filter – Projector – multimedia projectors