Quote Originally Posted by sanking
No surprising, since the Angulon is really nothing but a Dagor by another name, and Dagors are simply dreadful beyond about 85 degrees.
A Dagor and an Angulon are as similar as a Petzval and a Tessar. All the glasses are different, all the curvatures are different, and the order of elmnts is different. They are both 3+3, but that's the only similarity. Like Petzvals and Tessars are both two pairs - one cemented, one not.

Also, the Angulon design has been changed around WWII. As I said earlier, the older ones have less very sharp image circle, but a better acceptably sharp image circle for contact printing purposes - and if you don't really need ultimate sharpness in the corners.