Petri — 55mm f/2 standard kit prime for Petri's proprietary breech-lock bayonet SLR bodies
Petri (Kuribayashi Camera Co.) sold the 55mm f/2 as a standard kit lens for its Petri Penta and Petriflex SLR bodies during the 1960s and 1970s, positioned below the company's faster f/1.8 standard lens in the range. It used Petri's own breech-lock bayonet mount.
As a standard prime, the lens has a classic double-Gauss-derived optical design typical of period 55mm f/2 kit lenses, an automatic diaphragm coupled to the camera body, and all-metal barrel construction. Precise element count, filter thread and weight have not been confirmed from a verifiable source and are omitted here.
Rendering is characteristic of 1960s-70s standard primes: good centre sharpness from moderate apertures with softer corners and lower contrast wide open, plus warmer colour rendition from period lens coatings compared with modern glass. It performs adequately for general and travel photography on film bodies.
These kit lenses have little collector value beyond completing a Petri camera outfit and cannot be adapted to other mounts without specialist modification. Buyers should check the aperture and focus rings move smoothly and inspect the glass for fungus, haze or separation before purchase.