R: [APML] H-alpha solar photography nightmare

["Paolo Gramigna" <p.gram@tin.it>]

Hi,
I agree 100%! To look at the sun using that filter is DANGEROUS!
For the filter and (after cracking) for the retina!

paolo

-----Messaggio originale-----
Da: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org] Per
conto di John C. Mirtle
Inviato: Sunday, 06 October, 2002 23:27
A: astro-photo@seds.org
Oggetto: Re: [APML] H-alpha solar photography nightmare


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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