Petri Compact 17 In the 1960s, the ever-changing hobbyist photography market got a new trend to chew upon: the half-frame 35mm format on a 135 cartridge. Technology has evolved towards smaller film formats, from the early film available for amateur, the #120 format, to the #127, the smallest reasonable contact print, to the #135, #828, Rapid, Karat and Bolta. The...