Not sure if this should go here or in Large format.

Do they make an equivalent to 667 (the ISO 3000 B&W pack film) in 4x5 sheets?

Secondly, where the heck do I pick up a 405 back? I can't seem to find them anywhere online. I'd like to get a polaroid back for my pinhole camera, and for the cost, I think I'd rather go with the 405 and pack film over the 545 and 4x5 sheet film, but I'm drawing a blank on the 405 backs.

Thanks.

Try fuji fp3000b, that is available in 4x5.

If you use the fuji instant film then you will need a fuji-specific back. The film comes in pack form, not in sheets. So unfortunately you cannot process it later, but nevertheless it is great stuff.

just call customer service at Polariod they are always very helpful

Ahh I see. Type 57 appears to be the 4x5 version of 667. For some reason I missed that on the website.

Question still remains about a 405 holder - I can't seem to find that sucker online anywhere. I guess I could bite the bullet on the 4x5 holder, but $60/20 exp compared to $20/20 exp for the pack film makes my cringe at this stage.

Ebay will have the 405 holder. They are no longer manufactured but there are many NOS units or units with very very little wear.

Ahh. Didn't realize it is no longer made. I seem to recall seeing them at online a couple months ago. I wonder how much longer pack film is for this world if there are no backs/cameras made for it anymore...

Maybe I should just go with the 545.

For the price of 4x5 film you can shoot 5x exposures in packfilm. The $40 price for the film back (405 or 545) is irrelevant.