Re: [APML] M13 with Canon 1Ds

["Bert Katzung" <katzung1@attbi.com>]

Hi Mike:
You have a remarkable number of "double" stars along the left side of that
image. Are they real or did a few of your frames slip out of register?
Bert

Bert Katzung
katzung1@attbi.com
www.astronomy-images.com

----- Original Message -----
From: "Mike Unsold" <mike@mlunsold.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Monday, March 17, 2003 4:34 AM
Subject: [APML] M13 with Canon 1Ds


> Clearer skies and warmer temperatures are starting to allow more
> experimenting with
> the Canon 1Ds. The following image is the sum of 22 2 minute exposures at
> ISO 250
> with noise reduction on. More image capture and processing details are
> available under
> the image in the following link:
>
> http://www.mlunsold.com/examples/1DS/1Ds-M13.html
>
> I am trying to color balance the 1Ds and your comments are most welcome.
> It appears that the Canon 1Ds has the following white balance factors:
>
> H-alpha = 3.65, Red = 1.02, Green = 1.0, OIII = 1.043,
> H-beta = 1.0, and Blue = 1.01. The factors are based on exposures
> of a white card and uniform light gray cloudy sky.
>
> Mike
>
>
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