Father Cason, I looked at the pics on e-bay and the lens looks similar to a "photar", mounted on an "M" extension tube, but how would you accurately focus it except on a "Viso"? There also doesn't appear to be any aperture ring on the lens, and all of the photars that I've seen, have adjustable apertures, they're also marked in mm focal lengths, ie. 12.5mm PHOTAR f/2.4, 25mm PHOTAR f/2 and 50mm PHOTAR f/4. They are listed for use on universal focussing bellows R, via intermediate rings # 14259. AND none of the aforementioned looks remotely like what's on e-bay. Anybody else in the group able to identify this item and help Father Cason? Art Tafil natstek@xxxxxxx