than 100. You really can't get much of an equation from three
points.
Hope this helps,
John Yeo
- Forwarded message --
From: Ballard Borich ballardbor...@juno.com
To: pinhole-discussion@p at ???
Date: Thu, 21 Jun 2001 10:28:53 -0400
Subject: Re: [pinhole-discussion
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 -
- Original Message -
From: G.Penate pen...@home.com
Don't think so, if you download Regression Analyzer
http://www.zdnet.com/downloads/stories/info/0,,000QE3,.html you just need
to
input any pair of values of KNOWN reciprocity corrections (Y axis)
corresponding to METERED values (X
I would like to enter in a meter reading, and have it give methe number of
seconds (or minutes) for the exposure with all filter factors and
reciprocity factors adjusted in. Factoring filters is easy, but I am hung
up on reciprocity.
If you don't eyeball your exposures, which I could bet you
Most modern graphing calculators can find curves of best fit. I have a
TI-83, and would be happy to provide more details on how to do it, or punch
in the numbers if you don't have access to one.
John
- Original Message -
From: Jeff Dilcher r...@hiddenworld.net
To: pinhole-discussion@p at
Hi Jeff,
www.curvefit.com goes into a bit of detail if you're interested in the math
- or maybe try a google search on linear regression and non-linear
regression.
Otherwise, I have a bit of mathematical ability and if you provide me with
your data I could construct an equation for a curve.
*** Warning ***
*** Technical Answer Follows **
** press delete key if technical questions bother you **
- Original Message -
From: Jeff Dilcher r...@hiddenworld.net
I am trying to develop a mathematical function which will
help determine reciprocity compensations.
As MS says, that