The Zeiss Ikon Contaflex is an over engineered and overly complicated leaf shutter SLR. They were manufactured from 1953 to 1974 and went through several iterations, each more complicated than the last. Most used synchro compur shutters and tessar lenses (bar a couple of cheaper models) so they were decent performers. Max shutter speed was 1/500 and maximum aperture was f2.8. The Contaflex iii brought swappable front elements, these included a 35mm, an 85mm and a 115mm. These were beautifully sharp but prone to delamination, especially in the Pro Tessar 35mm f4.