Yvar 13mm f:1.9 and Yvar 13mm f:1.8 Difference

[Mustafa Umut Sarac]

What is the difference between these two lenses , is there color grading , sharpness or reliefness difference between them ?

 

Umut

[Guest Glenn Brady]

The 13.0mm f/1.9 Yvar is a fixed focus D-mount lens with three elements. The 13.0mm f/1.8 Yvar D-mount lens focuses from three-quarters of an inch to infinity and has four elements. Probably, the lenses would have to be compared side-by-side to respond your questions (it seems unlikely buyers of 8mm equipment in the 1950s would've demanded such information of the manufacturer).