Petri — 135mm f/3.5 telephoto prime for Petri's proprietary breech-lock bayonet SLR bodies
Petri (Kuribayashi Camera Co.) was a Japanese manufacturer active from the 1950s through the 1970s, known for the Petri Penta and Petriflex SLR series using the company's own breech-lock bayonet mount. The 135mm f/3.5 was a telephoto option for Petri SLR owners alongside the standard kit lens.
The lens uses Petri's proprietary breech-lock bayonet fitting, unique to Petri bodies and not interchangeable with other manufacturers' mounts. It has an automatic diaphragm, a metal focus barrel with distance markings, and coated optics typical of mid-1960s to 1970s Japanese telephoto primes. Exact element count, filter thread and weight are not confirmed and are omitted.
Optical performance is modest by modern standards, with softer wide-open rendering that sharpens by two stops down and warmer colour typical of period coatings. As a proprietary-mount lens it can only be used on Petri bodies without adaptation.
Because the Petri mount was never widely adopted, these lenses have limited resale value and are bought mainly by Petri camera collectors. Buyers should confirm the lens is genuinely compatible with their specific body and inspect for fungus or haze.