I remember a microfilm format that size being used for aperture cards--for you youngsters, aperture cards were 80 column format punch cards that had an aperture (window) for inserting one frame of a microfilm image of an engineering drawing in the area normally used for the first 40 columns, and the second 40 columns were used for data. With the advent of the IBM Magnetic Card Readers in the early 1970's there were experiments with a similar format using magnetic coated stock, but as far as I'm aware, no commercial products resulted. In some aspects, the format is far superior to digital technology in that the data can recovered without sophisticated technology--all you need is a cheap lens, a light source, and the punch code. Bill -----Original Message----- From: ADavidhazy <andpph@xxxxxxxxxxxxxxxxxx> Sent: Mar 8, 2005 8:37 PM To: List for Photo/Imaging Educators - Professionals - Students <photoforum@xxxxxxxxxxxxxxxxxxxxxx> Cc: andpph@xxxxxxxxxxxxxxx Subject: Re: 46mm film Hi Alan, I think I have some of that film but am not sure ... well, I really don't know!!! ... what camera or system they belong to. Guess is some kind of a copy camera. andy
