Praktina FX (1953) - mike eckman dot com,Praktina FX (1953) - mike eckman dot com,The 1953 Praktina FX was the world’s first SLR system camera, with interchangeable lenses, prisms, and focusing screens, as well as spring-wound motor drive. , Taken for granted today, the Praktina’s ,Praktina: 1953-1960 - www.pentax-slr.com,Praktina: 1953-1960 - www.pentax-slr.com