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

["Chris Schur" <cschur@cybertrails.com>]

Well, for us ASA 400 is fine. but for many new astrophotograhers, the faster
the better.  This may be a great red sensitive film for budding prime focus
shooters.  400 asa is way too slow unhypered for our first steps into prime
focus.  Anyway, I bought a roll at Walmart today, and will give it a roll
this week.


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


-----Original Message-----
From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of Chris Cook
Sent: Friday, February 21, 2003 10:20 PM
To: Discussion of Film Astrophotography
Subject: Re: [APML] Another Hydrogen Alpha sensitive color film to
consider...


Anything grainier than PPF is getting unacceptable IMO, especially with
35mm.  If proven to be worthy for astroimaging, maybe this film could be
used if you stack at least 4-5 negs and then combine them with a TP
exposure.
Anyone for golf.........  ;-)


Chris

----------------------------------
Chris Cook
Astronomical & Nightscape Photography
www.abmedia.com/astro


-----Original Message-----
From: Jeff Ball <jeffball@zoominternet.net>
To: Discussion of Film Astrophotography <astro-photo@seds.org>
Date: Friday, February 21, 2003 11:42 PM
Subject: RE: [APML] Another Hydrogen Alpha sensitive color film to
consider...


>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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