The 210 Geronar was sold as a "student" lens.. Low priced entry into the LF world. As I remember it, it is a Tessar design. It is small, light, but covering power and resolution are probably les than a Sironar of similar age. I have one I bought, but "ripped" the shutter out of it for a 210 G-Claron. So I have the glass and Iris, but not much else, and have never shot the lens. Frank Filippone red735i@earthlink.net