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ASTRO: Sh2-261



 
 
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  #1  
Old February 18th 16, 10:48 PM posted to alt.binaries.pictures.astro
Stefan Lilge
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Default ASTRO: Sh2-261

Sh2-261 is am impressive emission nebula in northern Orion, not far from the
often imaged NGC 2174/2175. It is much fainter than it's famous
brother/sister, but still has a good surface brighness, so it is amazing
that I have not imaged it before.
I imaged it in three nights but ended up using only one night's data as
conditions had been bad in two of the three nights. There was only a diffuse
weak brightening in the middle of the nebula in OIII and SII was the same as
Ha, only weaker. I ended up doing a Ha:SII:SII.

Taken from Berlin with a Celestron RASA at f/2.2, G11 mount, Trius SX694
camera, 57x3min Ha and 34x3min SII.

Stefan

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  #2  
Old February 20th 16, 08:46 AM
WA0CKY WA0CKY is offline
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Posts: 689
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Quote:
Originally Posted by Stefan Lilge View Post
Sh2-261 is am impressive emission nebula in northern Orion, not far from the
often imaged NGC 2174/2175.
Stefan
How do you handle filters. Remove the camera for a screw in filter or use a filter drawer?

When I did filters in film work either way I was always fighting dust. In the farm field I worked in it was everywhere and no matter how careful I was it got on the filters. Drawer had the advantage the camera orientation was held steady. Even with a bayonet mounting I had issues with it rotating slightly with filter changes. Using a classic dark room rather than digital this made aligning the colors "interesting". This was in the 80's before digital had replaced the dark room.

Rick
  #3  
Old April 27th 16, 10:45 PM posted to alt.binaries.pictures.astro
Stefan Lilge
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Posts: 2,269
Default ASTRO: Sh2-261

Rick,

sorry for the late answer: I use a filter drawer with the RASA.
Actually dust is not a problem with such a fast scope, dust donuts are so
large and fuzzy that they are not really conspicuous (unlike my Meade ACF at
f/8, where they are very obvious).

Stefan


"WA0CKY" schrieb im Newsbeitrag ...


Stefan Lilge;1310107 Wrote:
Sh2-261 is am impressive emission nebula in northern Orion, not far from
the
often imaged NGC 2174/2175.
Stefan


How do you handle filters. Remove the camera for a screw in filter or
use a filter drawer?

When I did filters in film work either way I was always fighting dust.
In the farm field I worked in it was everywhere and no matter how
careful I was it got on the filters. Drawer had the advantage the
camera orientation was held steady. Even with a bayonet mounting I had
issues with it rotating slightly with filter changes. Using a classic
dark room rather than digital this made aligning the colors
"interesting". This was in the 80's before digital had replaced the
dark room.

Rick


--
WA0CKY

 




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