Yashica's budget C/Y standard prime — the ML 50mm f/1.9, multi-coated manual-focus glass for the C/Y mount.
The Yashica ML 50mm f/1.9 was a standard prime of Yashica's ML line for the Contax/Yashica mount, sharing the C/Y bayonet with Contax Zeiss lenses. It was often supplied as a budget kit lens on Yashica bodies.
This is a manual-focus C/Y-mount lens with a 50mm focal length and a maximum aperture of f/1.9. It fits the same bodies as Contax Zeiss glass and belongs to Yashica's better-coated ML series. Additional figures are omitted where they cannot be verified.
At 50mm f/1.9 the lens is a natural everyday standard for portraits, street and general use, slightly slower than the f/1.7 but still a compact, capable fifty. It is an easy first lens for C/Y bodies.
Used copies are very common and inexpensive as an entry standard for the mount. Look for internal haze, fungus and coating wear, confirm smooth focus and clean aperture blades, and check the front element. It adapts to mirrorless with a C/Y adapter.