Beautiful, one pin original Rollei-Zeiss HFT West Germany QBM mount 50mm f:1.4 lens for their SL series 35mm cameras. You would have to stop down the lens on their newer electronic cameras to measure exposure.
Glass is clean and clear, focus smooth and quiet throughout the range (although there is a little "slip" at a couple of places-quite mild-due to slightly dry lubricant. Aperture snappy and oil-free. Mild cosmetic paint wear to the aperture and focus control rings-I'd give it a 9+ or better. Lens does have an A-M switch.
Comes with Hoya UV filter but no caps.
Selling AS-IS, no returns.