Any of the polaroid backs will work. They all take basic 600 series pack film. (655, 654, 669, etc) Also, speaking of a polaroid back, you will need the tripod adapter if you wish to use the polaroid back on a tripod, the back extends down below the bottom of the camera and gets in the way of the tripod base unless you have this item.
Originally Posted by Digidurst
There is a shorty strap available that I have for my Super. The only problem I have is that with a polaroid back it doesn't fit, the back gets in the way. The strap itself fits on the right hand lug and kind of goes around the wrist. It helps keep the camera in your hand, but it does not function the same as the strap on the left hand grip does.
As for the macro question, I have only done a little. I have a number three tube which gives me pretty close focus, but I am not a huge macro shooter. One thing about the lenses, however, is that you might want a number one tube to shoot portraits with the 150mm lens. It doesn't focus quite closely enough to do a tight head and shoulders.