From: Sandy King (sanking@hubcap.clemson.edu)
Date: 12/29/00-04:13:43 PM Z
I agree with Carl in that BPF is not the best film for this contrast range.
However, you should be able to get to a DR of about 1.8 with ABC+ (Rollo
Pyro), which is fine for salted paper. Also, the Pyrocat-HD formula first
printed in Post-Factory (you can see the formulas as modified at
http://unblinkingeye.com/) will get you to a range of 1.8 with 18 minute
develolpment time at 72F, with an increase in B+F of only 0.06 over
development at 5 minutes. For this use it should be diluted 2:4:100.
Sandy King
>Rick,
>
>BPF200 is a good film, but difficult to raise to the contrast range
>needed for the processes you want to use. By far the best success I've
>had (looking for somewhat lower range appropriate for Pt/Pd) is with the
>ABC+ (also called rollo) Pyro formula in a rotary processor (Jobo).
>Extended time in standard MQ developers tends to increase overall
>density and base fog with this film, without the desired big increase in
>tonal *range*. Same with PMK pyro. Plain ol' D-76 seems the best of the
>MQ formulas for extending range with least base fog with this film. In
>general your best bet to get really extended range negatives is to go
>with a film like TXT or FP4-Plus which feature extremely low base fog
>and a long tonal scale expandable by extended development. 2.0+ ranges
>are easily achived with MQ developers or PMK pyro. (The advantage of
>pyro here is that many of the the negs will still be printable in silver)
>---Carl
>
>Rick Moore wrote:
>
>> Has anyone on this list had any experience using Bergger BPF 200 film
>> developed to the very high density ranges (2.2 or greater) required for
>> POP and albumen printing?
>
>
>--
>Website with online galleries and workshop information at:
>http://home.earthlink.net/~cweese/
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