How can I take pictures with a 35 mm SLR camera?

The focusing distance has to be estimated with any Rollei 35 variant, if no accessory rangefinder is used. Unfortunally Rollei did not ever offer such a thing. Nonetheless, at the time of the Rollei 35's introduction this was not unusual, as most contemporary viewfinder cameras did not have a rangefinder, either. However, to take full advantage of the exceptionally sharp performing lens of the Rollei 35, a precise range adjustment was desirable. Therefore, around the year of 1970, Rollei's development department thought of adding a rangefinder to the camera. But for an integrated rangefinder there simply was not enough room left in the camera housing. Remembering an external rangefinder mechanism with a turning prism similar to the one used in Zeiss Ikon Super Ikontas and Contessas, some engineering concepts were made. As the production shift to Singapore was in progress at that time, it sought up any surplus capacities for innovations, so this projected idea silently was abandoned.