Pentax's flagship professional SLR with weather sealing, titanium shutter, and K mount.
The Pentax LX, introduced in 1980, was Pentax's professional-grade 35mm SLR and remained in production until 1997 with incremental updates. It featured a titanium-alloy shutter, modular viewfinder system, aperture-priority auto-exposure, and environmental sealing against dust and light moisture. It was positioned to compete with the Nikon F3 and Canon F-1 for professional use.
Pentax K bayonet mount, titanium-alloy horizontal-travel shutter (4 seconds to 1/2000s), aperture-priority AE and manual, TTL OTF (off-the-film) flash metering, interchangeable viewfinders (FA-1, FB-1, FA-1W), environmental sealing.
The LX's standout features are its OTF flash metering (measures light reflected from the film plane during exposure for precise flash output) and modular viewfinder system. It accepts all Pentax K and M-series lenses. The LX is regarded as one of the finest mechanical SLRs in the Pentax system and is sought by professional film photographers.
Test all exposure modes and verify OTF flash metering with a compatible flash unit. Check the titanium shutter for curtain damage. Inspect viewfinder clarity and confirm the interchangeable finder mechanism operates correctly. Check environmental seals. Battery compartment contacts should be clean.