Quote Originally Posted by DREW WILEY View Post
Why on earth would anyone use anything other than a front surface mirror in a serious optical system? But you'd still have to polarize the light in the first place. So no answer there. ...
A front surface mirror certainly would be preferable. It would require more care in an open mount than they do in a SLR. The mirror or prism as sometimes used on process cameras should work well. If one must use a rear surface mirror, the polarizer would reduce the ghost image from the front surface, although not quite eliminating it completely.