RE: Polaroid 545 back

just what I was looking for. Thanks so much!

> -----Original Message-----
> From: Derek Watkins [mailto:100015.635@compuserve.com]
> Sent: Wednesday, August 29, 2001 8:59 AM
> To: 'INTERNET:pinhole-discussion@pinhole.com'
> Subject: RE: [pinhole-discussion] 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
>
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Received on Wed Aug 29 17:46:59 2001