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ASTRO: Sharpless 2-157



 
 
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  #1  
Old November 14th 10, 11:33 PM posted to alt.binaries.pictures.astro
Stefan Lilge
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Posts: 2,269
Default ASTRO: Sharpless 2-157

I took some frames for this image in three nights, but due to clouds, dew
etc only the data from one night was usable.

Taken from the middle of Berlin with a Skywatcher ED80 with 0,85 reducer on
a Skywatcher H-EQ5 Synscan mount, guided through the finderscope with
Lodestar/AstroArt, 6x20 minutes Halpha, 4x20 minutes OIII (Baader filters).

http://ccd-astronomy.de/temp4/Sh2-157colourgut.jpg

Stefan




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  #2  
Old November 15th 10, 12:13 AM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Default ASTRO: Sharpless 2-157

On 11/14/2010 4:33 PM, Stefan Lilge wrote:
I took some frames for this image in three nights, but due to clouds, dew
etc only the data from one night was usable.

Taken from the middle of Berlin with a Skywatcher ED80 with 0,85 reducer on
a Skywatcher H-EQ5 Synscan mount, guided through the finderscope with
Lodestar/AstroArt, 6x20 minutes Halpha, 4x20 minutes OIII (Baader filters).

http://ccd-astronomy.de/temp4/Sh2-157colourgut.jpg

Stefan


Nice wide field of this one. I can only image the very bright blob in
the core. You also picked up one of my favorite visual clusters, NGC
7510. Too me it looks like a broadhead arrow point with three razor
edges. That's lost in most images however. Yours picks it up fairly
well however.

Is the reducer also a flattener?

Rick

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Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".
  #3  
Old November 15th 10, 07:05 PM posted to alt.binaries.pictures.astro
Glen Youman
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Posts: 177
Default ASTRO: Sharpless 2-157

I imaged this one with my f4.5 90mm scope. I overexposed or
overprocessed and had horrendous gradients. Would have been happy if
mine had turned out half as well as yours did.




On Sun, 14 Nov 2010 23:33:23 +0100, "Stefan Lilge"
wrote:

I took some frames for this image in three nights, but due to clouds, dew
etc only the data from one night was usable.

Taken from the middle of Berlin with a Skywatcher ED80 with 0,85 reducer on
a Skywatcher H-EQ5 Synscan mount, guided through the finderscope with
Lodestar/AstroArt, 6x20 minutes Halpha, 4x20 minutes OIII (Baader filters).

http://ccd-astronomy.de/temp4/Sh2-157colourgut.jpg

Stefan

  #4  
Old November 16th 10, 08:01 PM posted to alt.binaries.pictures.astro
Stefan Lilge
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Posts: 2,269
Default ASTRO: Sharpless 2-157

Is the reducer also a flattener?

Rick, the reducer also flattens the image. The good thing about the
Skywatcher EDs is that they have a specialised reducer for each scope, so I
have a fitting reducer/flattener for the ED 80 and a different one for the
ED120. That's a far better approach than other makes (e.g. William) that
sell "universal" flatteners.
The Skywatcher flatteners work well for chips up to APS-C size (typical DSLR
chip), I never had any larger chips, so I can't tell if they give good stars
for a 35mm chip.

Stefan


 




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