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Weird halo on image (refractor / DSLR)


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Taking advice from others on the forum, I'm starting to use Siril. 

When I first hit "autostretch" on my image I get this weird circular halo. It doesn't matter too much on this image as I'll crop in, but on others e.g. starfields, it will.

Optical train is WO Zenithstar 71 > 2" to 1.25" adapter > 1.25" T-adapter > Canon 80d

What could be causing this?

Screenshot 2022-03-04 161644.jpg

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1 hour ago, GazK said:

What could be causing this?

Hi

The reduction to 1.25"

Use 2"/m48 connections throughout, a field flattener and take flat frames.

Cheers

Edited by alacant
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On 04/03/2022 at 20:08, GazK said:

Taking advice from others on the forum, I'm starting to use Siril. 

When I first hit "autostretch" on my image I get this weird circular halo. It doesn't matter too much on this image as I'll crop in, but on others e.g. starfields, it will.

Optical train is WO Zenithstar 71 > 2" to 1.25" adapter > 1.25" T-adapter > Canon 80d

What could be causing this?

Screenshot 2022-03-04 161644.jpg

Its being caused by the 1.25 inch adaptor. Its too small for the setup. 

Adam

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  • 2 weeks later...

Thanks to everyone who responded - no I'm not using a field flattener. About to hit "buy" on one to remove both the halo and the blurry stars.

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