I have a lens from a Kodak Monitor (takes 620) mounted on a lensboard for my Century Graphic. The lens is a four element 100/4.5 "Special Anastigmat" (tessar formula). The lens is teriffic. Shutter goes from 1sec to 1/400. I have never used the actual Monitor Body, but I can attest to the spectacular performance of the lens. One of the previous posters mentioned that he had one for $50. If the bellows are good, and it is overall functional, buy it!