recently i saw an old kodak manual on this problem. There is no curve to apply to reciprocity. It is a linear logarithmic function. perfect exposure changes with time at a certain distance logrithmicaly with unchanging aperture. www.glassplatenegativehow-to.com
------ Original Message -----
From: Jeff Dilcher
Sent: Tue, Jun 19, 2001 9:03am
To: <pinhole-discussion@pinhole.com>
Subject: [pinhole-discussion] Reciprocity Problem
*** Warning ***
*** Technical Question Follows **
** press delete key if technical questions bother you **
I have a technical question, that, perhaps someone on
the list can help me with. Please respond
directly if you like.
I am trying to develop a mathematical function which will
help determine reciprocity compensations.
Initially, I would like to be able to submit a small set of
reference values (metered exposure times along with
exposure time compensation for reciprocity). Using these,
I would like be able to enter in any exposure value, and
get a corresponding compensated value on the reciprocity
"curve".
I am trying to boil this down into an algebraic equation
as easily as is possible. I have quickly reached the
endpoint of my math abilities. Can anyone provide a clue
for me?
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Received on Tue Jun 19 19:02:06 2001
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