[pure-silver] Re: DS-10/HP5 curves and questions
- From: Craig Schroeder <craig@xxxxxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sun, 12 Jun 2005 20:34:14 -0500
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.
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