 Preceded by two "concept studies", the entry-level model with a triplet lens, the Zeiss Triotar f 3.5 / 40 mm, hit the market in October 1969.Initially, for the first concept study, Compur was asked for a simplified shutter with a limited timing range of 1/30 sec to 1/125 sec, which, however, was not cheap enough for an effective reduction in production cost.Therefore, the first concept study got an immovable lens tube.