This leader is taped to the front of the film protruding from the cassette then wound back into the cassette as necessaary. The overall length of this strip isnвЂ™t critical, whatвЂ™s important is the amount wound back into the cassette, which none for the RB67 ProS and 200mm for the Hasselblad A24. I cut a piece of clear Mylar film but it would be possible to use an offcut of 35mm film about 450mm long. WhatвЂ™s needed is a blank leader added to the front of the 35mm film. This only allows about 16 exposures in the A24 magazines before the film is fully wound out of the cassette. With 120 film the initial wind-in is mostly paper backing but with a 35mm cassette the wind-in is all film and this is wasted, leaving only 1m in the cassette to be exposed. The next issue to overcome is the amount of film wound on to the takeup spool before the camera is ready to take its first exposure: it can be upto 0.5m. Now I have a set of adaptors that would let me load 35mm cassettes into my A24 and ProS backs. In practice I use black parts to reduce the risk of internal reflections. I printed these in red as this makes the components easier to see. 3D printed cassette and spool adaptors for Hasselblad A24 film magazine shown loaded and ready for inserting in the back. Unfortunately these didnвЂ™t fit my Hasselblad A24 magazines nor the 35mm reloadable cassettes I have, and they wouldnвЂ™t advance the frame counter in the RB67 ProS back so I set about redesigning them so that they would work in a more universal way. A quick search of the Internet showed that the 3D printing community had produced adaptors for running 35mm film through rollfilm cameras and since I have a 3D printer I printed several of the open source designs. And what about the diameters? A 120 spool is 25.1mm and a 35mm cassette is 25.1mm (not including the light trap, which sticks out a few millimetres). Film sizesД¬omparing the lengths of film for 220-size and 35mm 36 exposure gives approximately 1.6m and 1.5m respectively. In practice I havenвЂ™t found this an issue as the film is flat enough in the centre 24mm width of the normal image.

The film runs vertically and is showing slight film curl at the perforated edges. A partly used roll of (scrap) 35mm film in an A24 film magazine.

Rolleiflex 2.8 vs hasselblad