Check this out, William Optics bino has Compression ring eyepiece holders. This feature with the rest of the package makes them the best deal going.See link: http://www.buytelescopes.com/product.asp?t=&pid=9676&m= Scotty
Binoviewers have been at the bottom of my long list of astro goodies to buy, however this looks like quite a bargain and WO has a good reputation for quality. Still, I'd want to read a number of reviews before purchasing. I wonder how these are matched to different scopes (type of scope and focal length).
I've been agonizing over the decision to get a binoviewer. I didn't know whether it would work with my equipment, and most of all, I just didn't know whether I would like using them. I was reluctant to go for broke on an expensive set, and I tend to believe that buying cheap is a waste of time and money. When I saw the WO setup, however, I thought, how can I go wrong? Binoviewers with compression rings, case, barlow, and two reasonably good eyepieces for under $250.00, including sales tax and shipping! Yow! I ordered a set today! If they work out, I'll upgrade later, and if they don't, I'm not out a potload of money. It's a win-win situation! Life is good. 8)
There are 10^11 stars in the galaxy. That used to be a huge number. But it's only a hundred billion. It's less than the national deficit! We used to call them astronomical numbers. Now we should call them economical numbers. Richard Feynman US educator & physicist (1918 - 1988)