Got it. I was figuring the paper backing had frame markings such as 120/220 film, hence the window on the camera back. Scott >-----Original Message----- >From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver->bounce@xxxxxxxxxxxxx] On Behalf Of Eric Neilsen Photography >Sent: Wednesday, April 19, 2006 12:32 PM >To: pure-silver@xxxxxxxxxxxxx >Subject: [pure-silver] Re: 828 film > >It lets the camera know that you have advanced the frame to the correct >"stop" to shoot a new frame. I believe it was an attempt to prevent >multiple exposures. > >Eric Neilsen Photography >4101 Commerce Street >Suite 9 >Dallas, TX 75226 >http://e.neilsen.home.att.net >http://ericneilsenphotography.com > > -----Original Message----- > From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver- > bounce@xxxxxxxxxxxxx] On Behalf Of Scott Hamming > Sent: Wednesday, April 19, 2006 7:42 AM > To: pure-silver@xxxxxxxxxxxxx > Subject: [pure-silver] Re: 828 film > > What exactly is the 'index' perforation and it's function? > > Scott ============================================================================================================To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.