Is that light pollu...
 
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Is that light pollution or something else?


(@msamazing)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 73
Topic starter  

Please see the attached image.  This was my final result after integration.  I was using a Radian Ultra Triad filter with my ASI2600 MC.

Any thoughts on what went wrong or is this expected.

IC1805combinelights RGB session 1 St

 


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(@wvreeven)
Galaxy Customer
Joined: 4 years ago
Posts: 2090
 

@msamazing That looks like light produced by the Moon to me. Did you take these images when the Moon was above the horizon? Note that the Moon is a strong OIII emitter.

If no Moon was visible then, yes, it may be light pollution.


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(@msamazing)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 73
Topic starter  

The moon was not above the horizon but shouldn’t that filter cut out light pollution?  I am using this filter:

 

https://optcorp.com/products/radian-telescopes-2-inch-triad-ultra-filter


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(@wvreeven)
Galaxy Customer
Joined: 4 years ago
Posts: 2090
 

@msamazing No, as I wrote the Moon is a strong OIII emitter (actually reflector) and you should avoid shooting OIII under moon light.

Having said that, the left and lower lower left of your image seem to have an excess of OIII when compared to other OIII images of this nebula on internet. That seems to indicate it is light pollution.

BUT it could be due to flats or other calibration files as well. Have you checked those and verified that they were taken correctly?


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