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ASTRO: M-51



 
 
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  #1  
Old April 1st 08, 04:51 AM posted to alt.binaries.pictures.astro
George Normandin[_1_]
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Default 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




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  #2  
Old April 1st 08, 05:32 AM posted to alt.binaries.pictures.astro
Richard Crisp[_1_]
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Default 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







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  #3  
Old April 1st 08, 06:22 PM posted to alt.binaries.pictures.astro
George Normandin[_1_]
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Default 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  
Old April 6th 08, 06:56 AM posted to alt.binaries.pictures.astro
Doug W.
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Default 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  
Old April 6th 08, 11:47 PM posted to alt.binaries.pictures.astro
George Normandin[_1_]
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Posts: 1,022
Default 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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