Re: [APML] H-alpha solar photography nightmare

["John C. Mirtle" <jmirtle@shaw.ca>]

Emmanuele;
    The Lumicon filter is a wide band filter meant to shoot deep sky objects
with Kodak tech pan. It is also handy for correcting chromatic problems with
crappy lenses and reducing light pollution. It was NEVER intended for
viewing/shooting the sun!! I hope that you are doing some kind of
pre-filtering before this filter as it cannot absorb solar energy without
cracking.
    I do not do any solar work, but my understanding of the DayStar filters
is that they are a very narrow Ha pass system - just a few nanometers. They
are a very different animal from Lumicon and are designed to safely reject
solar energy. If you want to view prominences and other solar "stuff", then
you will need the right equipment.

John Mirtle
Calgary, Ab. Canada

----- Original Message -----
From: "Emmanuele Sordini" <vega@ulisse.it>
To: <astro-photo@seds.org>
Sent: Sunday, October 06, 2002 4:13 PM
Subject: Re: [APML] H-alpha solar photography nightmare


Hello Brian,
what do you mean by that? Perhaps the filter I'm referring to is intended
for photographic use only? If so, then I wonder how one could find any
structures in any way other than visually.... or just blindly taking
snapshots and hoping for something to show up in the pix?

Sincerely hope somebody will help me (us?) out.

Emmanuele

P.S. Just one more (unimportant) detail: the film used is Kodak Elite Chome
200, i.e. the non-professional version of E200.

At 15.42 06/10/2002 -0500, you wrote:
>I dont believe this is the intended H-a filter for solar observing.
>
>If anyone cares to expound, im all ears too
>
>Brian


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