Owen Automatic MC 300mm f/5.5 Lens for Pentax K

The Owen Automatic MC 300mm f/5.5 is a vintage, manual-focus telephoto prime lens designed for Pentax K-mount 35mm film SLR cameras. Featuring an extended 300mm telephoto focal length paired with a modest f/5.5 maximum aperture, it provides strong optical reach for isolating distant subjects in sports, nature, wildlife, and landscape photography. Constructed with multi-coated (MC) glass elements and a solid all-metal lens barrel, this vintage prime can also be adapted to modern DSLR and mirrorless camera systems.

Key Features and Specifications

* Pentax K Mount: Compatible with classic Pentax 35mm film SLRs, Pentax digital DSLRs, and easily adapted to modern mirrorless camera bodies via a Pentax K adapter.
* Telephoto 300mm Focal Length: Delivers a long telephoto reach on full-frame format (450mm equivalent field of view on APS-C sensors).
* f/5.5 Maximum Aperture: Compact telephoto design that balances optical reach with a manageable barrel weight.
* Multi-Coated (MC) Optics: Multi-layer element coatings designed to suppress internal flare and ghosting while enhancing color rendition and contrast.
* Fully Manual Operation: Long, tactile manual focus throw and mechanical aperture ring for deliberate operational control.
* Durable Vintage Build: All-metal barrel and mechanical construction.

Condition and Included Accessories

* Included Accessories: Rear lens cap included (front lens cap is NOT included).
* Physical and Optical Condition: Operates mechanically; internal optics contain visible dust as well as internal haze, which may reduce image contrast, clarity, and overall performance in bright or backlit conditions.