Petri's fixed-lens 35mm rangefinder — Circle Eye selenium meter, leaf shutter, 1963.
The Petri 7s is a fixed-lens 35mm rangefinder made by Petri of Japan, introduced in 1963 as a development of the earlier Petri 7. It sits in Petri's 'Circle Eye' rangefinder line, aimed at everyday photographers who wanted a coupled rangefinder and a built-in meter in an affordable package.
This is a coupled-rangefinder 35mm camera with a fixed lens and a leaf shutter. Exposure is guided by a selenium photocell that requires no battery, arranged around the lens in the Circle Eye layout. Focusing uses the coupled rangefinder, and the leaf shutter operates within the lens. Operation does not depend on a battery.
The 7s suits users after a mechanical, battery-independent rangefinder for general and street photography. Its fixed lens and selenium metering favour a considered shooting pace, and it works as a durable travel companion for photographers comfortable with manual exposure.
On inspection, confirm the selenium meter still reacts to light, since these cells fade with age. Check the lens for haze and fungus, verify the rangefinder patch is present and correctly aligned, run the leaf shutter through its speeds to catch sticking, and assess the light seals and film-advance feel. A failed selenium cell cannot be revived.