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ASTRO: M-51
A 10:6:6:10 minute LRGB exposure with STL 1301E camera thru a 20-inch F/8 RC
Cass. George N |
#2
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ASTRO: M-51
I took the liberty of making a tweak or two
you have excellent data: good flats too. but the blue channel's black point was skewed brighter than the red and green there were a few other things regarding the relative strength of blue relative to red and green was also adjusted i can't do anything with the cores though and there's only so much I can do starting with a jpeg. calibrated FIT stacks of LRGB would be a lot of fun... "George Normandin" wrote in message ... A 10:6:6:10 minute LRGB exposure with STL 1301E camera thru a 20-inch F/8 RC Cass. George N |
#3
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ASTRO: M-51
"Richard Crisp" wrote I took the liberty of making a tweak or two...... Richard, I cranked up the 'blue' at the end just because I like blue! I also did not spend too much time processing this one. It was very dark that night so there is little background to work with. I need more data on a night with better seeing. With other versions of this I used the color balance suggested by Astro-Don's color calculator, but unfortunately he never got response data for the STL-1301E, so I've been using "ST-10" or "ST-9". I also did another version balancing with one of the stars in the field. The Navy USNO 2 star catalog shows one to be nearly the same red & blue magnitude, so I adjusted for that. In the end I'm just going to have to take the time to calibrate this system on a G-2 star...... but not on a night when it's 14 F and I have 6 other people bugging me to see what I'm doing and to look thru the other scopes! I had people bumping the scope, turning the lights on without warning, etc. It's still better than dealing with the coyotes on my own. I've been trying a "Rob Gendler" method on the past few images: create a RGB from the color data, process and smooth out the noise, then split it back up into color channels that you use to make the LRGB. The jury is out, but who can disagree with Dr. Rob???? I can e-mail you a full 48-bit color fit file if you can handle that. The jpg was compressed of course, and reduced in size. George N |
#4
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ASTRO: M-51
The 20" seems to be set up pretty well George... Nice stars.
-- Regards, Doug W. www.photonsfate.com "George Normandin" wrote in message ... A 10:6:6:10 minute LRGB exposure with STL 1301E camera thru a 20-inch F/8 RC Cass. George N |
#5
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ASTRO: M-51
"Doug W." wrote ... The 20" seems to be set up pretty well George... Nice stars. Thanks Doug! I really need to calibrate this system to a G2 star. Unfortunately our clear weather seems to have slipped away. I also wanted to test out my new Denk II binoviewer on my Obsession 20, but that will have to wait also. George N |
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