You ask questions to learn. A rollfilm back is a nice thing to have, sometimes I wish I had two. I used to use PKR 64 Kodachrome in mine quite a bit - an emulsion unavailable in larger sizes, and now unavailable period. The 6x7 transparencies when projected must be seen to be believed. I used that film in my Rollei, too, but the 6x7 back allowed me to use it with lenses from 75mm to 420mm.
Originally Posted by fran