I tried the largest size available but did not feel I could fit it comfortably to the eyepiece on my Hawke Eclipse.

The rubber boot woulkd just about have stretched over the very end but it would have been a struggle to get it over the locking rings. I felt I would have had to get the positioning of the cover absolutely right 1st time as it would have been too tight for any fine adjustment afterwards, or the locking rings might haev moved whilst trying to twaek the cover.

Pity cause I was sold on the idea and the cover was made of quality materilas.

I'd try again if they extended the range to include a larger version.

Couple of blurry pics here

http://img809.imageshack.us/img809/716/img1793ij.jpg

http://img89.imageshack.us/img89/3375/img1792p.jpg