Kollmorgan Super Snaplite BX241 f/1.9 projection lens adapted to Sony E-Mount
A 35mm theater projection lens by Kollmorgen Optical Corp, BX241 f/1.9, 3 1/2 inch. Adapted to Sony E-Mount with 2 combined macro extension tube kits for $22 [ Yashica AF Macro 60mm f/2.8 @ f/5.4-ish ]