Re: [APML] IC2118, the Witchhead Nebula

["tan@home.com" <tan@home.com>]

John,

	Thanks, yes I purposely did not want Rigel in the field. The reflections 
off of the gel filter can cause all kinds of problems, especially from a 
star this bright. I think I've tried shooting a field with bright stars 
before. The reflection was not the only problem. I think it also 
effected the evenness of the background.

Loke




John C. Mirtle wrote:

> Nicely done Loke!  You managed to get Rigel far enough out of the field to
> avoid the reflection problems that plagued my tri-colour attempt. Your
> background is much more even, and I like the way your image also frames the
> witches' hat. Your colour balance is close to mine, which was taken with RGB
> of 17:60:65, with a 12 minute unfiltered shot for the luminance channel
> taken a couple of years earlier. http://members.shaw.ca/jmirtle/whead.htm As
> you may recall from earlier this year, Dave Rowe pulled some density numbers
> from the red and blue POSS plates around the witches nose, which I used to
> determine final colour balance. That extra hour on the blue channel was
> really worth it - very nice detail!
> 
> John Mirtle
> Calgary, Ab. Canada
> 
> ----- Original Message -----
> From: <tan@home.com>
> To: <astro-photo@seds.org>
> Sent: Sunday, October 28, 2001 2:43 AM
> Subject: [APML] IC2118, the Witchhead Nebula
> 
> 
> 
>>Here is a shot of the Witchhead nebula in Eridanus. Seeing conditions
>>were average. The sky was dark but not extremely so. To get as much of
>>the nebulosity, the blue channel was exposed for 110 minutes or almost 2
>>hours at f/1.5. I found this to be a difficult object and would be glad
>>to listen to any comments to improve it.
>>
>>http://www.starryscapes.com/nebula/witchhead.html
>>
>>Loke
>>
>>
>>
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> 
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