It is interesting to purposely sabotage lens desigers’ intent by mixing and matching elements from one lens with those from another. In this case I had a General Scientific Corporation Superlumo 4.75″ projection lens for 35mm which is a standard Petzval design with four elements in two groups. Unfortunately, the rear cemented doublet had some balsam separation, so I decided to cannibalize another projection lens on hand, an Emil Busch Neokino, and use the rear element group of that lens in combination with the front group from the Superlumo. I find the results interesting. The lens has a tremendous amount of uncorrected spherical aberration, and is none too sharp to begin with, but the final effect I find quite interesting.
