Film thickness - large format / ULF

[walter23]

Are all films equally thick? What's a good standard thickness for the slot in the filmholder that accomodates the film?

 

[Photo Engineer]

Roll film is generally 0.005" thick and sheet film is generally 0.007" thick.

PE

 

[Jim Jones]

The 1951 ANSI specifications for the thickness of the slot is a minimum of .012 inches. I've used older sheet film with a .010 inch base, and graphic arts film maybe half as thick.

 

[walter23]

Does anyone know the full ANSI spec for film holders, or know where to find it, or what the number is so we can find it?

 

[Jim Jones]

The spec I cited was A38.1.51-1951 "American Standard Dimensions for Photographic Double Film Holders of the Lock-Rib Type," approved April 19, 1951 by the American Standards Associaton, Incorporated. I believe there is a later specification, but don't know where to download it or this one.

 

[Dan Dozer]

The film holders I've made recently I've made the slot depth twice the thickness of a sheet of film or roughly .014 inches. The sheet film I was using (J&C 100) is about .007" thick. I've started using Bergger 200. I haven't measured the thickness, but it seems to load just as easily as the J&C.