RE: Polaroid 545 back

Laura

Excuse me for butting in. I regularlyuse Type 55 at ISO 25 and use the
following reciprocity corrections:

Indicated exposure Correction factor Final exposure
        8 seconds 2x 16 seconds
        16 seconds 2.5x 40 seconds
        32 seconds 3x 96 seconds
        64 seconds 4x 256 seconds
        2 minutes 5x 10 minutes
        4 minutes 6x 24 minutes

Hope this helps.

Regards
Derek Watkins

----------
From: INTERNET:pinhole-discussion@pinhole.com
Sent: 27 August 2001 22:13
To: "'pinhole-discussion@pinhole.com'"
Subject: RE: [pinhole-discussion] Polaroid 545 back

 
Bill, When you rate Type 55 at ISO 25, is there a need to calculate for
reciprocity failure. If so, how do you do so? I've been using Type 55 with
my Leonardo with some good results but I've just been guessing at the
exposures. I'd appreciate any suggestions you have.
Laura
Received on Wed Aug 29 10:03:20 2001