> -----Original Message----- > From: Kevin Waterson [mailto:[EMAIL PROTECTED]] > > On Fri, 4 Oct 2002 10:22:09 -0400 > "tom" <[EMAIL PROTECTED]> wrote: > > > > > 120, 220, 70mm, polaroid. Supposedly NPC is coming out > with a digital > > back, but I haven't seen any announcement. > > ok, what is the difference between these backs?
120 and 220 are standard MF film sizes. The 645n gets 16 frames per 120 roll, 33 per 220. You need a different back for each because 120 has a backing paper, 220 doesn't. Basically, 120 sits a wee bit closer to the lens. 70mm is similar, but it has sprocket holes and is longer. If you wanted to use 70mm, you'd have to buy it from B+H. I think it gets 90 exposures, costs about $900. Polaroid is Polaroid, digital is digital. You want 120 or 220, or both, depending on how you shoot. More film is available in 120, so if I had to choose just one, I'd go with the 120 back. tv
