Re: Reciprocity failure with paper

I doubt you'll have much trouble. Correct paper exposure in the darkroom is
traditionally a matter of trial and error, or at least repeated trials,
anyway. There have been several discussions here about this topic. My
impression is that you get some reciprocity effect beginning at maybe a half
hour exposure, not much before that.
----- Original Message -----
From: "Guy Glorieux" <guy.glorieux@sympatico.ca>
To: "Pinhole List" <pinhole-discussion@pinhole.com>
Sent: Sunday, December 16, 2001 1:43 AM
Subject: [pinhole-discussion] Reciprocity failure with paper

> Hi everyone,
>
> Does anyone have information about reciprocity failure with paper. I
> have to print large format prints which require long exposures (several
> minutes) and can't open the lens without creating vignetting on teh
> edges of the print.
>
> It would help if I could know more about the appropriate correction
> factor to use for exposure times of say 1 minute, then 2 minutes, then
> 3minutes and so on.
>
> Thanks,
>
> Guy
>
>
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Received on Sun Dec 16 07:54:15 2001