A good general rule of thumb is to add 1 flash for every 4 you calculate to
take into accound the intermittency effect (rather like reciprocity
failure). So if you calculate 4, give it 5, if you calculate 16 give it 20,
and so on. By the time you get to a calculated 64 flashes, you actually
need to give 80!
Hope this helps
Derek Watkins
-----Original Message-----
From: "Michael Keller" <m.w.keller@verizon.net>
To: <pinhole-discussion@pinhole.com>
Subject: RE: [pinhole-discussion] Calculating accumulated flash for my
pinhole camera...
Date: Thu, 6 Dec 2001 23:12:29 -0500
Reply-To: pinhole-discussion@pinhole.com
No. You have to double the previous number of flashes for each F/stop
change.
F22.........1 pop
F32.........2 pops
F45.........4 pops
F64.........8 pops
F90........16 pops
F128.......32 pops
F180.......64 pops
Never done it with pinhole, but done it plenty of times on large format.
Watch for reciprocity failure.
Mike Keller
Received on Fri Dec 7 12:35:23 2001
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