Vivitar's wide-angle — the MC 28mm f/2.8 with multi-coating for various mounts.
The Vivitar MC 28mm f/2.8 is a wide-angle prime from Vivitar's Multi-Coated (MC) range for Pentax K mount. Vivitar distributed Japanese-manufactured lenses from various production sources including Cosina, Kiron, and Tokina; quality varied by version. The 28mm focal length provides a moderate wide-angle view for landscape, architecture, and documentary photography.
28mm focal length, f/2.8 maximum aperture, multi-coated (MC), Pentax K bayonet mount, manual focus.
The 28mm f/2.8 is a practical wide-angle for everyday Pentax K photography. The MC coating improves flare resistance over earlier single-coated equivalents. The specific optical quality depends on the production source, which varied across Vivitar's OEM relationships. A cost-effective wide-angle option for the Pentax K system.
Inspect for fungus, haze, and coating condition. Test focus helicoid smoothness. Confirm K-mount engagement. Check aperture blades for oil contamination.