The Petri 7s is a 35mm fixed-lens rangefinder camera made by Petri in 1962 as an improved replacement for the Petri 7 of 1961. Like that camera, it has an around-the-lens selenium cell light meter, which reads Light Values 7 to 17. This is improved in the 7s by the addition of a second match-needle display on the top plate; the original model has the meter display only in the viewfinder. This top-plate display was retained in later models. There is a translucent panel on the front of the top housing, in front of the shutter release button; this panel served no purpose, and was absent in a later second version of the camera.
Other differences from the previous model include an improved film advance lever (pictured below right) and frame counter. The lens is the same as in the previous model; a coated 45mm f/2.8 or f/1.8. A clamp-on hood was supplied, and the lens accepts 52mm screw-in filters; these will cover the meter sensor, so exposure will be corrected for the filter. The leaf shutter gives speeds from 1 to 1/500 second, plus 'B', and is synchronised, switchable between X- and M-synch. with a small lever on the lens barrel. There is also a self-timer. The brightline frame in the viewfinder is also slightly improved, having extra marks for parallax error correction when focused close up.
Production ended in 1973, and the 7s was superseded by the Petri 7s II in 1974.
- According to McKeown; other sources say '63; perhaps the delay between announcement by Petri in Japan and availability in foreign markets. McKeown, James M. and Joan C. McKeown's Price Guide to Antique and Classic Cameras, 12th Edition, 2005-2006. USA, Centennial Photo Service, 2004. ISBN 0-931838-40-1 (hardcover). ISBN 0-931838-41-X (softcover). p579.
- User's manual at Mike Butkus' Orphan Cameras.