Re: [APML] Film Exposure Data

[Adam Stuart <eisenklein@yahoo.com>]

The purpose of my question: to
intelligently/accurately list exposure data correctly
when I review my prints and make notes for myself.
Thanks for your comments.

ADAM
--- Matt BenDaniel <matt@starmatt.com> wrote:
> Adam,
> 
> What is the purpose of your question?
> Are you trying understand to how record and
> interpret exposure notes?
> 
> For dew, I record relative humidity, which I can
> measure with a $30
> device.  I have obtained excellent exposures even
> when my meter said 99%
> RH and my car was dripping with dew.
> 
> For transparency, I determine limiting visual
> magnitude, and based on my
> familiarity with the site, I guess the transparency
> on a scale of 1 to
> 10 how clear.  10 is perfect and I don't think I've
> ever seen that. 
> Maybe I've seen an 8.5 once in Arizona.  AFAIC if
> the transparency is
> worse than 4, it's probably not even worth bothering
> to do AP.  I
> suppose you could measure transparency in a
> structured way with an
> ST-4.  Also see: http://www.cleardarksky.com/csk/
> 
> For seeing, I look at stars at zenith and the
> horizon and in between and
> guess on a scale of 1 to 10.  I've seen one 9 night,
> and it was
> religious experience.  The ST-4 error numbers also
> provide some
> indication.  The STV provides even more analysis.
> 
> Look at the notes by the images on my web site, and
> you'll see examples.
> 
> Adam Stuart wrote:
> > Can I get some accepted definitions to consider
> when
> > using the terms "Dew, Transparency, and Seeing"?
> -- 
> Matt BenDaniel
> http://starmatt.com
> 
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> <http://astro.umsystem.edu/apml/>  ---
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