----- Original Message -----
From: "Guy Glorieux" <guy.glorieux@sympatico.ca>
>
> There are no reciprocity failure charts for paper, but it is just as
> real as for film. So I'll have to make some tests before next week but
> I expect to end up with an exposure time of maybe 8-12 hrs.
Guy, I have a reciprocity table for paper in my page
http://members.rogers.com/penate/pinsize.htm it only gives you corrections for
up to 20 minutes, but I just rapidly extrapolated some other values I hope are
of some use for you as "starting point". Here they are:
For 30' multiply time by 7 for a total of 3 1/2 hrs
For 1 hr multiply time by 9.5 for a total 9 1/2 hrs
For 1.5 hrs multiply time by 11.5 for a total 17 1/4 hrs
For 2 hrs multiply time by 13 for a total 26 hrs
For 2.5 hrs multiply time by 14 for a total 35 hrs
For 3 hrs multiply time by 15.5 for a total 47 hrs
For 6 hrs multiply time by 21.5 for a total 129 hrs
> The plan is to calculate the focal length/F-stop based on the weather
> outside so as to be able to open the shutter at 00:00hr on Sunday April
> 28 and to let the exposure run until 24:00hr.
That is a wise decision!
Wish I could be there! :-(
Best of luck, Guy and your fellow photographers.
Guillermo
Received on Wed Apr 17 10:21:56 2002
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