Quote Originally Posted by sanking
I had a 210mm f/6.8 Angulon at one time in the past and the circle of illumination was slightly greater than that of my 210 Computar. However, performance at the corners, even for contact printing, was dismal. The 180mm (8X10) Protar V I have gives much better performance on the corners than the 210 Angulon, as does the 210 Computar.

No surprising, since the Angulon is really nothing but a Dagor by another name, and Dagors are simply dreadful beyond about 85 degrees.

Sandy
I agree that dagors perform very badly beyond 85 deg! I thought I was the only one who felt this way.