Recip rule of thumb is 10% compound for every stop over one second; each manufacturer will say when their reciproity comes into play, one second, one and a half ... etc. So, add the extra time to penetrate the layers of film equally, or compensate for that failure in reciprocity.
S. Shapiro
----- Original Message -----
From: Stephen Harris
To: pinhole-discussion@pinhole.com
Sent: Friday, January 05, 2001 9:56 AM
Subject: [pinhole-discussion] Recip failure on long exposures
Greetings All,
I'm new here so if this has been discussed before, my apologies.
I am a cinematographer and got interested in pinhole while shooting commercials -- where for obvious reasons, very long exposures aren't an issue. Now that I've got a pinhole still camera, however, I am interested in scenes that call for 7, 15, even 30 minute exposures before adjusting for recip. failure. Problem is, as far as I can tell, neither Kodak or Fuji offer any guidance on exposures of this length. If anyone's got any info or experience to share, I'd really appreciate it.
Cheers,
Stephen M. Harris
Received on Sun Jan 7 13:09:20 2001
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