Pentax's compact manual-focus telephoto prime — lightweight 200mm f/4 with excellent build quality.
The SMC Pentax-A 200mm f/4 is a manual-focus telephoto prime for Pentax K-mount, released in 1983 as part of the A-series lens lineup. The A designation indicates an A position on the aperture ring for automatic program exposure on compatible Pentax bodies — autofocus is not available on any Pentax-A lens. At approximately 410g and 52mm filter thread the lens is moderately compact. A built-in retractable lens hood is integrated.
Manual focus only — no autofocus on Pentax-A series lenses. Eight aperture blades. The 52mm filter thread is a Pentax heritage standard (note: front element rotates on focus, relevant for polarising filter use). At approximately 410g the lens is moderately lightweight. Minimum focus distance of 1.9m. The A position on the aperture ring enables automatic program modes on compatible K-mount bodies. f/4 maximum aperture. No ED glass in the standard (non-starred) version.
The 200mm f/4 manual focus perspective on K-mount provides the classic medium telephoto compression for portrait, sport, and wildlife photography where manual focus is acceptable. On APS-C K-mount bodies (K-1 crop mode or APS-C DSLRs like K-70) the 200mm provides a 300mm equivalent. The A position on the aperture ring enables aperture-priority and program exposure on Pentax K bodies from the ME Super era onward without requiring stop-down metering.
On the used market the SMC Pentax-A 200mm f/4 is very affordable as a vintage Pentax manual telephoto prime. Condition checks: aperture blades for oil contamination, manual focus ring smoothness through the full range, and front element for marks. The built-in hood's retraction mechanism should operate cleanly. Compatible with all Pentax K-mount bodies.