Ken, > Also a 75mm Goerz > Centigor. Lets see who knows that lens! NOT you Les! The centi-gor was the 7th revision of Tri-gor which was the 3rd revision of the Da-gor, or "there"-gor. One American group tried to make a version of this, but it was inconsistantly sharp, very low contrast, and rather bland. It was dubbed the no-there-gor but then just shortened to Al-gor.