The 2.8F and the 3.5F following earlier post-Second World War professional-market Rolleiflexes with broadly similar characteristics, but gradually improving developing sophistication and performance. Rolleiflexes with f/3.5 lenses where known as Rolleiflex Automats before 1956 and went through many variations well documented in collector’ books and websites here on the net. The final Automat that was known as the Automat MX-EVS because of its Synchro Compur shutter had both M (bulb) and X (electronic) flash synchronization and exposure value settings fitted with a 75mm f/3.5 tessar. The advent of the Rolleiflex 3.5E for the professional market in 1956 and the Rolleiflex T for the amateur market in 1958clearly separated the target market for Rolleiflex in a way that had not happened before. Franke and Heidecke had previously taken the view that those who could not afford a Rolleiflex should buy a Rolleicord, a sister production and model to Rolleiflex.