At this time to differentiate between negatives taken with the older complan lens and negatives taken with the later minox lens, MINOX introduced an edge code in the negative. Since the MINOX C (the first camera released with the new minox lens) every 8x11mm camera had a distinct edge code to identify the camera. The reason was that commercial processors used MINOX enlargers. As the minox lens replaced the complan, so the enlargers had to change lenses: MINOX II enlargers were curved negative track and complan lenses, MINOX III enlargers were straight negative track and minox lenses. Ironically, owners of Rigas and model II cameras would get better results from a MINOX III enlarger than a MINOX II enlarger.