Re: [APML] Some solar shots (film!)

["D. Kodama" <kodama@alumni.caltech.edu>]

Thanks, Steve.  The prominences are dim compared to the surface details,
so that's why my shot is a composite.  You might want to try bracketing
your exposure to see if the prominences will come out in a longer shot
with your camera.

By "digi cam", do you mean a digital camera?  I haven't tried it myself
but it occurred to me that you really ought to use a monochrome imager for
solar H-alpha.  In a color imager, you will typically throw away 3/4 of
your pixels because they are green or blue.  It's possible the green
pixels have a broad passband and will have some low level signal in them,
but who knows what happens when the built-in software tries to
interpolate?  So my thought is if you are going to use a digital camera,
use one with a big chip (lots of pixels) and fill the FOV with the sun. 
Then downsample the image by a factor of two to get "real" resolution.

Anyway keep trying.  It's certainly possible to get good H-alpha solar
shots since there are a lot on the web and they are all done digitally.

Dave




> Hi David--Wow---nice shots!
> I especially like being able to see the prominences.
> The prominences and the granular appearance of the sun is totally
> missing in  my attempts with a digi cam.
>
> I think your false color efforts came out excellent!
>
> Steve
>
> At 02:04 PM 10/30/03 -0800, you wrote:
>>Hi all,
>>
>>I had the opportunity to experiment with an H-alpha filter, so being a
>> film addict, I thought I'd try it with film:
>>
>>
> <http://www.eanet.com/kodama/astro/2003/1027/>http://www.eanet.com/kodama/as
> tro/2003/1027/
>>
>>Also, here's a view of the sun "filtered" through the smoke of the
>> recent Southern California fires:
>>
>>
> <http://www.eanet.com/kodama/astro/2003/1028b/>http://www.eanet.com/kodama/a
> stro/2003/1028b/
>>
>>For awhile it was looking like world was coming to an end around here,
>> but at least in my area the sky had more real clouds than smoke today.
>>
>>Dave Kodama
>>
>>
>>
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>>



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