That's a pretty small filter size. I wonder how much of the image may be blocked if you mount lens that is a bit larger? I guess you're probably only interested in the center anyways but just wondering.
This will work on Binos also I believe. I plan to use it with Maven 11x45s Thats the nice thing about the Novagrade That little rubber fitting will fit a verity of sized eye pieces. At least thats what the reviews say =-)