Aside from the obvious issue of weight and bulk on the back of a scope and such, to which if I could would just setup some kind of a tripoded raile to hold both the camera and scope so that one or the other is not bearing weight down on it. So this thread is basically based on curiousity, not out of nessesity since I have other means of doing what I want. The quick question is.... do T-Adapters exist for some medium format cameras. The details of what I've been using: Celestron C90 Mak with the camera adapter tube as picturered here (click image for more images). The nice thing about the scope is that I can view down from the top if I wish, but also from the back. Also the back peice you can remove the eyepeice holder or angle viewer and attach the T-Adapter for the scope itself. Allowing me to view from the top and switch to the bottom with a camera attached. The direct path on the back does not go thru an eyepeice at all but straight into the camera. The scope is a 3.5" (90mm aperture) Maksutov-Cassegrain Spotting Scope and is waterproof so both front and back are closed off. More information about the scope can be seen at the manufacture's website here http://www.celestron.com/c2/product.php?CatID=30&ProdID=203 (though its interesting, I didn't think they would be using my picture at the bottom ) Far as the camera I been using on the back, I've used my digital rebel, Canon EOS-1, and Canon FTb via either the EF or FD T-Adapter for the camera itself, but been wondering bout the possibility of using something such as my RB67 on the back of the scope, and higher speed film. My main concern is actual coverage, I wouldn't be using a eyepeice on the scope, so its whatever the back of the scope can output, but not sure exactly what coverage it can give even with maybe some distance between the film plane and the scope. I suppose if I riged up some kind of rail with the scope and RB67 on it, and maybe UV or some other form of protector so I Can leave the front of the RB open, then extend the distance back and forth between the scope and the RB67 to see where I get focuse, based on focusing off the top of the scope first, then mvoing the RB67 back and forth on the back. Your Thoughts? PS: What would be real fun is to be able to do it to a 4x5 , though I doubt that even more.