Cobra CMC Wide-Auto MC 28mm f2.5 Prime Lens Olympus OM Mount Caps Tested

Description

The Cobra CMC Wide-Auto MC 28mm f/2.5 is a fast vintage manual focus wide-angle prime lens built for Olympus OM mount 35mm SLR cameras. Featuring a bright f/2.5 maximum aperture, this lens provides a noticeable light gathering advantage over standard f/2.8 wide-angle optics of its era. Outfitted with multi-coated glass elements for enhanced contrast and flare prevention, smooth rubber focus grip, tactile aperture ring with detents from f/2.5 to f/16, and a 55mm front filter thread. Serial number 092821. Native Olympus OM bayonet mount.

Condition

Overall Condition: Very Good

Cosmetically in very good pre-owned vintage condition with clean anodised barrel metalwork and bright, crisp distance/aperture markings. Focus ring rotates smoothly and evenly across the focusing range. Aperture ring stops crisply at each value, and the diaphragm blades are clean, oil-free, and snappy. Optics are clear and bright with green multi-coatings intact, free from fungus, haze, or scratches. Metal bayonet mount is clean and mounts firmly. Serial number 092821. Fully tested and operational.

Included

• Cobra CMC Wide-Auto MC 28mm f/2.5 Prime Lens for Olympus OM (Serial No. 092821)
• Cobra CMC Front Snap-On Lens Cap
• Rear OM Mount Lens Cap

Key Features

• Fast f/2.5 maximum aperture offering enhanced low-light performance and subject separation
• Multi-Coated (MC) optical elements for improved colour rendition and reduced ghosting
• Wide 28mm focal length ideal for street, landscape, and environmental portraiture
• Tactile diamond-pattern rubber focusing grip for precise manual control
• Standard 55mm front filter thread size
• Native Olympus OM Mount compatible with classic OM-series SLR bodies and modern mirrorless digital cameras via simple adapters

Collector's Notes

Third-party Japanese prime lenses with faster f/2.5 maximum apertures from the 1970s and 1980s represent excellent value for film photographers and adapted digital shooters alike. Offering a third-stop extra speed compared to typical f/2.8 lenses, this Cobra CMC unit delivers a bright viewfinder image on manual OM bodies while remaining lightweight and compact.

Keywords

Cobra CMC 28mm f2.5, Fast 28mm Prime Lens, Olympus OM Wide Angle, Vintage Multi Coated Lens, OM Mount 28mm, Manual Focus Prime, Tested Olympus Optics