Re: [APML]: h-alpha filters...info wtd.

["Gordon Garcia" <gordg@megsinet.net>]

The Astro-Photography Mailing List
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Jim - The 0.6 ATM filter from Daystar should do the job. You will still see
prominences, but the disk detail will have more contrast than a 0.7 filter.
The 0.5 will show disk detail with even more contrast. The prominences will
still be visible, but with narrower passband filters they will not be quite
as bright. The best way to observe solar prominences is with a coronagraph.
These are availble from Baader Planetarium in Mammendorf, Germany.  They are
also very expensive. If you are using a video or CCD camera you could also
consider a Daystar T-Scanner where you will be able to tune the filter very
quickly from the centerline of H-alpha to off band. The effect visually and
on video is really dramatic going from essentially a white light image to
the centerline. If you do get involved in H-alpha solar observing consider
participating in the Association of Lunar & Planetary Observers Solar
Section. Our Web site can be found at:

http://www.lpl.arizona.edu/~rhill/alpo/solar.html

Gordon

-----Original Message-----
From: Jim Barclay <cosmos@fan.net.au>
To: astro-photo@nightsky.com <astro-photo@nightsky.com>
Date: Saturday, July 18, 1998 10:22 AM
Subject: [APML]: h-alpha filters...info wtd.


>The Astro-Photography Mailing List
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>
>G'day all,
>
>I am seriously thinking of getting a H-alpha filter to do some solar
>research. I will observing and or video taping the events.I need to know
>what is a good all round resolution factor...0.5 0.7 Angstroms....I wish
>to view and tape, solar proms. and the granulation of the disc. What
>scope type and min. aperture is reqd. for above?
>
>Any info, or links greatly appreciated!!
>
>thanks a bunch fellas...
>
>Jim
>
>