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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]

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