Re: [APML] IC5068 and reducing color exposure time

[<cschur@cybertrails.com>]

Mike, your new technique works remarkably well!  Since I will be primarily
doing Ha imageing with my new ST8, I have a few questions, first, how did
you determine the GB exposures?  and second, what RGB combine ratio do you
have to do with this highly asymetrical data to get the final image?

Chris Schur

> With the recent 16 hour Tech Pan and 60 hour CCD images, this
> 6 hour Ha IC5068 image might be in the minor league.  There is an
> additional color image (mouse over) that was achieved with only 17 mins
> additional color information:
>
> http://www.af9y.com/ic5068c.htm
>
> As long as there is no reflection emission, you can obtain a color image
> from the deep Ha image by taking a short series of green and blue
> channel exposures.  The trick is to expose just long enough to match the
> smaller star sizes in the Ha image.
>
> For the 30 min CCD Ha, the green and blue channels were only 2 and 3.5
> mins long (no binning).  Of course, 3 of each were taken to allow a
> median combine.  The final result is an HaGB image which has a close
> approximation of RGB for the stars while retaining good nebula detail.
>
>
>
> Mike Cook, AF9Y
> http://www.af9y.com
> mwcook@cris.com
>
>
>
>
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