Exchange your ideas about the various Rollei 35mm SLR cameras. Including the 2000 and 3003 series. Excluding the classic Rollei35 which has it's own forum.
I thought the back with the 36/72 note gives you the possibility to make half frame on a 35mm (36 picture) film.....
But I have been informed that this is not possible. Mayby 72 pictures was possible when you cut your own length of film from a 5 or 20 meter 35mm roll film.
There is an extra pressure plate for 72 picture use.