RE: [APML] Another Hydrogen Alpha sensitive color film to consider...

["Jeff Ball" <jeffball@zoominternet.net>]

Hello Chris,
Thanks for pointing this out.  Perhaps someone can walk us through some of
the curves on this film.  I am familiar with the spectral sensitivity, but I
am not sure how to read the characteristic curve or the spectral dye curve.
Is there any correlation of the characteristic curve in these tests and the
reciprocity failure we see in astronomical exposures?  Do these curves
matter?  Also, can anyone relate to the grain index of 48 for this film.
What was PPF grain index?  OK, I found that answer.  Looks like PPF has a
grain index of 42 for 35mm film at 4.4 magnification.  That is my benchmark
for grainy film<g>  Thanks for any help on this. I will try and paste a link
to the tech info page for this film.  It is long, hope it comes through OK.

http://www.kodak.com/global/en/consumer/products/techInfo/e2452/e2452.shtml#
Curves

Jeff Ball
www.astro-photography.com

-----Original Message-----
From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of Chris Schur
Sent: Friday, February 21, 2003 11:05 PM
To: APML
Subject: [APML] Another Hydrogen Alpha sensitive color film to
consider...


I havent tried it personally, but Kodak Max Versatility plus film has a
sharp peak at exactly the Ha line for the Cyan layer.  It looks very
promising - and for an ASA800 film, may be the answer to your slow sytems.
Has anyone tried it yet?

Take Care,

Chris
Astro:  http://www.psiaz.com/schur/astro/index.html


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