The Yashica DS-M 50 mm f/1.4 was the final fast fifty in the Yashica lens lineup before the launch of the Yashica ML 50/1.4 (for Contax/Yashica mount)
-Yashica 50mm f1.4 Yashinon DS-M
-Minimum focus distance: 0.5m
-Aperture blades: 6
-Size: 63 x 44mm
-Weight: 281g
-M42 Mount