Optomax — preset 200mm f/4.5 T-mount telephoto with M42, Pentax K, Nikon F and Minolta adapters
The Optomax 200mm f/4.5 was a preset-aperture telephoto sold by UK camera dealers through the 1970s, part of a wider catalogue of Japanese-made lenses marketed under the Optomax house name. It built on the T-mount system common for budget telephotos of the period, giving one barrel that could be adapted to several camera brands.
Sold as a T2-mount lens with screw-in adapters, listings confirm fits for M42, Pentax K, Nikon F, Minolta MD and Exakta bodies, alongside dedicated M42-only production. Some examples use a dual-ring preset aperture control rather than a single click-stop ring. Aperture stops down to around f/22.
Rendering is typical of simple 1970s telephoto formulas: usable contrast stopped down, softer performance wide open, and a long focus throw suited to deliberate composition rather than fast tracking. The dual-ring aperture mechanism on some copies is a point of curiosity among collectors.
Used prices are low, often under twenty pounds for a T2-mount example with adapter. Check the correct rear adapter is included, confirm the preset ring turns smoothly without binding, and inspect for fungus and haze, common in lenses stored in damp conditions.