The Petri 7s was introduced by Petri in 1963 as a variant of the Petri 7 which was introduced in 1961. The main difference being an improved film advance lever and frame counter. It took 35mm film, had a coupled rangefinder. Production of the 7s ended in after 10 years in 1973. Compared to its predecessor, the 7s is very advanced. It has ATL (around the lens) selenium metering with a match-needle visible both in the viewfinder as well as the top of the camera. From the 7s came the compact Petri Color 35, which was wildly popular when released in 1968. The 7s was available with either a 45mm f1.8 or f2.8 lens and both are coated plus have a 52mm filter thread mount. The shutter is a Petri MVE leaf (in-lens) with speeds up to 1/500 of a second, and the viewfinder used Petri's Green-o-Matic system. It also has a timer on the side of the lens along with a flash setting lever with W and X settings plus PC external flash connection. The retail price in 1963 was about $60.00 to $80.00.