Pentax's vintage telephoto zoom — a basic 80-200mm for K-mount film cameras.
The Pentax PK 80-200mm f/4.5 is a vintage telephoto zoom for the Pentax K mount system. The PK designation suggests this is from Pentax's early K-mount era, covering the standard telephoto range. It provided affordable telephoto reach for Pentax film photographers who did not need the speed of faster prime alternatives.
Optical performance is basic. Sharpness is acceptable in the centre when stopped down but unremarkable across the frame. The simple optical design limits wide-open performance. Colour rendition benefits from Pentax's multi-coating. Adequate for casual telephoto work and general photography at distance but not suitable for demanding applications.
Pentax K mount, manual focus. Filter thread is likely 52mm. Weight is approximately 480 grams. Build quality is solid metal construction typical of the era. The push-pull or two-ring zoom design depends on the specific version. Compatible with all Pentax K-mount bodies including modern DSLRs with stop-down metering.
Very cheap on the used market — often under £20. Check for smooth zoom and focus operation. Not a lens to seek out deliberately, but if found bundled with a camera body it provides basic telephoto coverage. The Pentax DA 55-300mm or Tamron 70-300mm are dramatically better modern alternatives at modest cost.