From: Don Bryant (dsbryant@mindspring.com)
Date: 10/19/02-07:38:54 AM Z
Shannon,
> I can probably print these negatives with some care, but I
> wonder if anybody has done any testing about reciprocity failure and
Yes, use John Sexton's reciprocity data, it works very well.
> how people estimate their long exposures. My exposures ranged from
> about five seconds to ten minutes, in one case. Most of them were
> about two to three minutes.
>
Those are extremely long exposures for daylight.
If you have any HC-110 you could develop in dilution B which is then diluted
1:49 for about 20 minutes @ 70F. Of course this is only a suggested starting
point, you may need to extend or shorten the development time a bit, however
this is a very dilute solution so be sure to use a sufficient volume of
developer. 2 liters should work okay for a single sheet (this is for tray
development, I don't know what volume you are using for drum). This method
is recommended by Bruce Barnbaum and it works very well. Even with that much
compensation of development you may need to reduce the negatives with a
negative reducing formula using ferricyanide. You will need to test and see
what works.
> Kodak's chart says, for example, that if your metered time is 10
> seconds, your actual time is 50 seconds, and to cut development by
> 20%. I haven't been trimming the development time, but I plan to
> start doing that for the next batch to see if that helps.
>
It sounds like your zone 3 exposures are going to end up on zone 5 (or
higher). You should be able to save the negs but they may be a little
grainy.
If you don't have the Sexton reciprocity charts I can send you a copy off
line as an Excel spread sheet or a formatted text file.
Good luck,
Don Bryant
> --shannon
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