Chinon's 55mm f/1.7 — a dependable Japanese M42 standard prime.
The Chinon 55mm f/1.7 is a Japanese standard prime made in M42 mount by Chinon, a maker of M42 SLRs and lenses. It was a standard normal lens of the Chinon screw-mount range, a common and dependable fifty of the era.
This is a manual-focus M42 screw-mount lens with a 55mm focal length and a maximum aperture of f/1.7. Focus and aperture are set by hand on the barrel, with an automatic diaphragm. It is a compact all-metal standard prime. Detailed element figures are not asserted here beyond the verified focal length and aperture, following the accuracy standard.
The slightly-long 55mm standard view suits portraits, street and general photography, with f/1.7 giving useful low-light performance and moderate subject separation. Chinon standards render cleanly with pleasant character, making it a tidy everyday normal lens well suited to adapted use.
Used copies are affordable and fairly common. Inspect for haze, fungus and cleaning marks, confirm the aperture blades are clean and oil-free, and check the aperture-ring and focus feel. Verify the M42 mount before purchase for a screw-mount body. An M42 adapter makes it a characterful standard on mirrorless.