[pure-silver] Re: DS-10/HP5 curves and questions
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sun, 12 Jun 2005 18:33:29 -0700
----- Original Message -----
From: "Craig Schroeder" <craig@xxxxxxxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Sunday, June 12, 2005 6:34 PM
Subject: [pure-silver] Re: DS-10/HP5 curves and questions
>
>
> John Black wrote:
>
>>
>>What was the D of the fb+f, did you measure it? =20
>>
> It was .40
>
>
>>Objectionable fog usually
>>only occurs at too high pH or too much time in
>>development. Properly ma=
> de
>>DS-10 should be very low pH (7.9-8.1) so that shouldn't be
>>a problem.
>>
> I don't have a meter but my pH papers showed a 7.5+ a bit.
> HP5+ in 35mm=20
> is always on the high side for FB+F for me. The medium and
> large format=20
> behave quite well, though. I think I was at least 10%
> over-developed on=20
> these.
>
> I had noticed that the meter in my slr was a bit different
> in subdued=20
> light than my normally trusted incident meter (the one I
> use for setting =
>
> up for film testing) and spent a bit of time today
> comparing my meters.=20
> My two incident meters (old Sekonic L-398 and Sekonic 718)
> agreed when=20
> placed in shadow at the gray card but my metered slr's and
> Minolta spot=20
> meter showed almost an additional =83 stop needed. In
> bright lit=20
> situations all of the meters agreed and the Sekonics also
> agreed with=20
> the other metering with the reflective discs attached and
> also the 718=20
> with the spot attachment. Some casual checking of this
> over the years=20
> had me quite confident that I was getting accurate
> metering with any of=20
> these in any mode but today's more careful check shows I
> should be less=20
> confident. I've sent the spot meter in every 3-4 years for
> calibration=20
> and then used that to check my other meters. Each time,
> it's come back=20
> with no adjustments needed so perhaps I've become too
> confident...?
>
> I'm going to start from scratch on all of this and if I
> spot anything=20
> interesting, I'll report back. Thanks for the responses.
>
How are you making the test exposures for your
sensitometric curves?
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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