Leica I

The Leica I is the first series-production 35mm camera made by Ernst Leitz of Wetzlar, Germany, based on Oskar Barnack's prototype. It was presented at the Leipzig Spring Fair in 1925 and used 35mm film to make 24x36 mm frames, the format that became the standard for compact cameras. Early examples came with a 50mm f/3.5 lens, later sold as the Elmar.

Text from OyList