Quote Originally Posted by vpwphoto View Post
I once my bottle of ROR claims a 1 stop gain. I was afraid it would mess things up. Don't want my 300 2.8 to become an f2.0

I used caps as often as I know which pocket I put them in.... generally the work is more important that putting a cap on the lens that I am not using.
One stop gain over what? Have they ever looked at a one-stop ND filter? That would be one filthy lens. I love advertising - I'm sort of surprised they didn't promise it would get you l@id.

(I'm not claiming the cleaner is no good, just commenting on the ad.)