[pure-silver] Re: Zone Data Project
- From: <rgacpa@xxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Fri, 22 Sep 2006 14:03:04 -0700 (PDT)
Well, for example, a very knowledgable friend has worked out the following for
FP4+ in a specific developer and dilution and specific processing technique
(stand developing in this instance):Exposure ASA DevTime
N-2 40 8min
N-1 50 9.5
N 64 12
N+1 64 15
N+2 80 18-20
As you can see, both the ASA used for exposure and the developing time change
based on how much compression or expansion you want. Thus my term "fluid".
I hope this helps explain,
Bob
Bob Adler
Palo Alto, CA
http://www.raflexions.com
----- Original Message ----
From: Ralph W. Lambrecht <info@xxxxxxxxxxxxxxxx>
To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, September 22, 2006 1:45:08 PM
Subject: [pure-silver] Re: Zone Data Project
N+ and N- are pretty well defined. What do you mean with 'fluid'?
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
On 2006-09-22 22:33, "Jim MacKenzie" <jim@xxxxxxxxxxx> wrote:
>
> ----- Original Message -----
> From: <rgacpa@xxxxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Friday, September 22, 2006 2:15 PM
> Subject: [pure-silver] Re: Zone Data Project
>
>
>> My review of the massive dev chart is that it doesn't contain N+ or N-
>> information. My shallow understanding of the zone method is that both ASA
>> and dev times usually change to achieve expansion or compression.
>> Perhaps I've missed something on the massive dev chart site that contains
>> this info?
>
> There probably are charts that have information like this, but generally, N+
> and N- development times, as well as N, have to be determined by testing a
> given film with your technique and metering habits, as well as your own
> equipment. The very definition of N+ and N- is pretty fluid so you need to
> establish what these mean to you so that you can figure out what appropriate
> development modifications to make to achieve the results you want.
>
> Jim
>
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