Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site brand.UUCP Path: utzoo!linus!philabs!cmcl2!seismo!lll-crg!dual!qantel!hplabs!sdcrdcf!oberon!brand!barad From: barad@brand.UUCP (Herb Barad) Newsgroups: net.rec.photo Subject: Re: Thoughts on the Zone System Message-ID: <158@brand.UUCP> Date: Fri, 9-Aug-85 13:01:07 EDT Article-I.D.: brand.158 Posted: Fri Aug 9 13:01:07 1985 Date-Received: Wed, 14-Aug-85 22:10:02 EDT References: <54600009@trsvax> <4088@alice.UUCP> <1418@peora.UUCP> <286@harvard.ARPA> Reply-To: barad@brand.UUCP (Herb Barad) Organization: U. of So. Calif., Los Angeles Lines: 30 In article <286@harvard.ARPA> sasaki@harvard.UUCP (Marty sasaki) writes: > >Anyone who does a lot of photography will do things that fit within >the Zone System, even though they don't know it. Most serious >photographers will come up with a personal film speed for the films >that they shoot most often. The development of film is also played >with until the contrast is right (allowing printing "normal" negatives >on "normal" graded paper). Glance through Adams' "The Negative" and >you will see that determining film speed and normal development are >important first steps in the Zone System. Marti's short article was excellent. I just want to emphasize how important the above paragraph is. For myself, I use Tri-X Professional (120 size) film that Kodak rates at 320 and suggests 9 minutes development. Using the methods to determine your personal ASA and time, I got an ASA of 800 and a developement time of 10 minutes (HC-110 B). That might sound like a lot off of Kodak's specs, but I now know that I was previously overexposing my film. Then I would print down and it would be flat. Now, the my exposure is no longer pushed up into the top part of the curve, but I now have the full range. I also get an extra stop to use! This is not to suggest that anybody else should use my specs, just that you should check this out with your own equipment and your own developement. -- Herb Barad [USC - Signal and Image Processing Institute] ...!{lbl-csam,trwrb}!trwspf!herb or ...!{lbl-csam,trwrb}!trwspf!brand!barad