This is the mid-1990's design that Al Nagler bought from the ATM company and copied for his TeleView Binoviewers. You don't see many of these fine binoviewers around. Indistinguishable from TeleView models. Totally adjustable, BK4 prisms - just like the TV models. Complete with 1-1/4" TV-2X amplifier element. Compression-type eyepiece holders with black anodized inserts to keep dust out. $650 + shipping/insurance.