I have a Polaroid Automatic 100 packfilm camera which has the (well documented) under-exposure-in-low-light problem. Because of that, I bought a 355 which is much better and I now use as my regular Polaroid camera. So, I have an Automatic 100 which is spare. I also have a CU-5 camera outfit with a pair of lenses (the 3" and 5" - 75mm/f4.5 and 127mm/f4.7 respectively). What better project than to couple the camera body with one of these manual lenses and get a flexible - controllable - Polaroid camera? I would like to use the 75mm lens for this project (since I'm a sucker for wide-angle shots), but from asking around (and searching) I get the impression that the 75mm lens is just not suitable... something about not being able to focus at infinity or something? (I have some ideas about modifying the locking position of the folding struts so that I can get down to the 75mm focal length BTW) To add to the confusion, there seem to be different '75mm Tominon' lenses out there; the CU-5 version and the MP3/MP4 version. Does anyone know whether there is a real difference?? Seeing as the mount for the two lenses (75 & 127) is the same, I am tempted just to give the 75mm a go and see what happens - then switch to the 127mm lens if it really is unworkable. Are the specs for these various lenses available online anywhere? I have done some searching but keep coming up against the impression that the CU-5 & MP4 lenses are 'different' in some way. So many questions!