I too am interested in the polaroid back. What model #s will work with my Super Speed? Thanks!

The current models, and the ones I recommend, are the 545i and 545Pro. They take the individual sheet film like the Type 55 which offers a print or negative. A very good selection of films including a sepia toned one.

There is a holder for pack film, I never remember the number (405? 500?), but I've also heard rumors that the 4x5 pack film will be discontinued. Not 100% sure about that.

The 545i/Pro holder sheet films are by far the best though...

There's also the older 545 (no 'i' or 'Pro'). Some people like it better because it was all metal. I have one. Don't like it any more or less than my 'i' plastic model...

They are all widely available on the used market...

the pack film back is the 405, and there are still some 550 backs floating around, but the most common one you will see is the 405, which requires a graflok back to use.

Fuji, just announced at PMA, that it has improved the FP100 pack film and will contiue to offer for a minimum of 4 years.

So it is still around and available, and is quite good film for the instant market.

Dave

......The 405 is the 3-1/4” x 4-1/4” pack film holder, the 550 is the 4x5 pack film holder. The 500 and the “Graphic Polaroid Back” are the discontinued models. The 545 (or 545i/pro) holds the 4x5 sheet film. The pack film is cheaper, especially the 3-1/4” x 4-1/4” but nothing is more convenient then keeping a few different ISO 4x5 sheets on hand (in the fridge) if you need to make a quick test print.