John still has his first SLR camera which he bought in the 1960s. It is a Pentacon 6 medium format 120/220 roll film camera with interchangeable finders, focusing screens, lenses and various accessories. We photographed it with pentaprism finder and two Carl Zeiss lenses: 50mm f2.8 and 180mm f2.8. The telephoto has a 35mm Pentax thread adapter where it functions as approximately 360mm.
For more info and lists of accessories see http://www.pentaconsix.com/