Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/5/84; site rochester.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!houxm!vax135!cornell!uw-beaver!tektronix!hplabs!hao!seismo!rochester!bryan From: bryan@rochester.UUCP (Bryan Lyles) Newsgroups: net.rec.photo Subject: Re: Good Films Re: 5247 Message-ID: <510@rochester.UUCP> Date: Mon, 10-Sep-84 08:21:45 EDT Article-I.D.: rochester.510 Posted: Mon Sep 10 08:21:45 1984 Date-Received: Fri, 14-Sep-84 05:56:29 EDT References: <43@ism70.UUCP> Organization: U. of Rochester, CS Dept. Lines: 30 Since there has been a resurgence of interest in 5247 type motion picture films for still camera use, I will repeat my remarks of last year. Tungsten light is deficient in blue with respect to daylight (notice that tungsten and daylight are imprecise terms). Therefore the blue sensitive layer in a tungsten film is about 1 stop more sensitive than the red and green layers. If you expose a tungsten film to daylight you will either overexpose the blue or underexpose the red and green layers in the highlights and shadows. There is no way to "color balance" such a negative. I have tried, believe me. I even tried one of Pat Dignan's super soups; it did not work. On the other hand, if you expose through an 85B filter the film is great (if you get FRESH film). However, motion picture film have a layer of carbon based rem-jet antihalation backing on them to surpress static in the motion picture camera. This gunk is as welcome as a tar baby in a commercial processor's tanks. Thus you either have to do it yourself (its not THAT hard) or send it to RBG or ... All negative material can be used to produce slides. There is nothing special about 5247, etc. However, the standard Eastman print film is optimized for mechnical properties, not longevity. A hundred time through a projector destroyes the film anyway so why worry about print life. There is a long life print film, I don't know if RBG, etc use it. -Bryan Lyles (allegra, seismo)!rochester!bryan