Itorex — third-party manual-focus 28mm f/2.8 wide-angle prime, M42 and SLR mounts
Itorex was a minor third-party lens trading name of the 1970s and 1980s, part of the crowded field of budget Japanese-made optics sold under smaller labels to fit popular SLR systems of the day. The 28mm f/2.8 was a standard wide-angle prime, competing with better-known independents on price alone.
The lens is a manual-focus wide-angle prime with a maximum aperture of f/2.8, a common specification for consumer 28mm optics of the period, built to a conventional metal or metal-and-plastic barrel typical of independent lenses. Documentation on the brand is sparse; mount availability should be confirmed against the individual lens.
As with most obscure third-party primes, optical performance favours affordability over refinement, with softer corners wide open and better contrast once stopped down. It offered SLR owners a cheap way to add a wide-angle option without buying first-party glass.
Itorex lenses are rarely encountered in the UK used market and carry little collector premium, making condition the main factor in value. Check the focus helicoid for smooth, even travel, inspect the aperture blades for oil, and verify the exact mount before purchase.