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Horsehead: Reloaded
Hi Guys
I played with the color of Barnard33 which I spent 4 days across October collecting subs.
The goal was to see what I would get when exposing longer sub frames at a much lower ISO. Previously I imaged at ISO 800-3200... mostly ISO1600 since my guiding was giving me star trail... only recently I started getting my guiding sorted out... basically I dumped the guide scope idea and used a radial off-axis guider. The best thing is that I don't have to scale down my images anymore to try to hide the star trails.
This image is where I re-tweaked the color, basically I added the Ha 50% to the Red channel in the RGB, and still used the Ha channel as luminance.
All using the full spectrum Canon 40D and the 8SE on a CGEM.
I'm very happy with the result I ended up with.
Total exposure time was 10 hours 26 minutes and 40 seconds. I used any semi usable (even test shots) in RGB... the most care was taken in collecting the Halpha data.. I only threw out 2 1800s frames in all that time due to the stars being slightly too oval.
Baader H-Alpha 7nm filter
8 x 1800s subs at ISO400
5 x 1500s subs at ISO400
5 x 900s subs at ISO500
6 x 900s subs at ISO800
Color through Baader Neodumium
9 x 300s at ISO1000
5 x 600s at ISO400
1 x 70s at ISO3200
1 x 30s at ISO3200
Thanks for looking.
Mariusz
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