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Red Glow around Images

Astrophotography Filters Imaging Refractor Observing
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#1 ChrisSnowdenAstro

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Posted 25 February 2021 - 04:39 PM

Hi ... brand new to deep sky imaging and am using an ASI294 along with Optolong Lextreme filter on a Z81 refractor. All my images seem to have a red border  i know the filter picks out the Ha in nebulae but its on every image in exactly the same place. Is this standard using this filter ????

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#2 daveco2

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Posted 25 February 2021 - 04:50 PM

You mean a red vignette, most pronounced at the corners?



#3 bobzeq25

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Posted 25 February 2021 - 05:08 PM

Nice start.

 

You need flats and dark flats (also darks).  Plenty of threads here about how to do those.



#4 KTAZ

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Posted 25 February 2021 - 05:11 PM

Yes. Flats will solve that issue.

 

I also see what appears to be some horizontal banding in the heart of the nebula. This can probably be remedied by dithering.



#5 Alrakis

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Posted 25 February 2021 - 05:20 PM

Also, it is odd, but it looks like either coma or some other aberration, especially in the stars on the left side of the image. The stars on the right side look less affected, but it is slightly there on that side. You might have an issue with the tilt somewhere in your optical system. Just an observation so you don't take data and are not happy with the results.

 

Chris




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