Anyone know what could cause trange rings/colored banding around bright stars with Hyperstar v4 on 9.25" edge HD - Forums

Topic starter

Dec 24, 2024

Hello & Happy Holidays,

I am encountering a new issue with all bright stars in targets I've been imaging the last couple of weeks. The brighter stars have bands or diamond shaped rings with different colors in wave like form around them. Please see attached example of a 10 second image of Rigel. The issue is with 9.5" Edge HD using Hyperstar v. 4, ASI2600MC Pro camera and Antlia Triband RGB Ultra Filer II. I've checked the collimation 3 times using the "out of focus donut shape" method and it appears spot on. I've checked focus with Bahtinov mask and the EAF and it appears good too. I am using a black non-reflective dew shield and have the red LED light from the camera covered in black tape. Any ideas of what could be causing this issue? Could it still be some kind of tilt issue with Hyperstar? Or maybe an issue with the filter (the filter is 'frozen' in its holder in the Hyperstar and I need time to unlock it without damaging it so cannot remove it yet to test)? I've tried shorter subs 10 sec, 30 sec up to 60 sec with gain of 100 - all have the same result.

Any input would be greatly appreciated. Thanks so much for your time and clear skies to all!
Gina

Respectful Engaging

andrea tasselli

Frequent contributor

Dec 24, 2024

It's the filter. Not much you can do otherwise.

TiffsAndAstro

Dec 24, 2024 · Edited: Dec 24, 2024

Gina Knight:
Hello & Happy Holidays,

I am encountering a new issue with all bright stars in targets I've been imaging the last couple of weeks. The brighter stars have bands or diamond shaped rings with different colors in wave like form around them. Please see attached example of a 10 second image of Rigel. The issue is with 9.5" Edge HD using Hyperstar v. 4, ASI2600MC Pro camera and Antlia Triband RGB Ultra Filer II. I've checked the collimation 3 times using the "out of focus donut shape" method and it appears spot on. I've checked focus with Bahtinov mask and the EAF and it appears good too. I am using a black non-reflective dew shield and have the red LED light from the camera covered in black tape. Any ideas of what could be causing this issue? Could it still be some kind of tilt issue with Hyperstar? Or maybe an issue with the filter (the filter is 'frozen' in its holder in the Hyperstar and I need time to unlock it without damaging it so cannot remove it yet to test)? I've tried shorter subs 10 sec, 30 sec up to 60 sec with gain of 100 - all have the same result.

Any input would be greatly appreciated. Thanks so much for your time and clear skies to all!
Gina

Try it without the filter, and also replacing it with a UV/ir cut filter see the difference test maybe ?

Andrea, above is almost certainly right though

Gina Knight

Topic starter

Dec 24, 2024

TiffsAndAstro:
Gina Knight:
Hello & Happy Holidays,

I am encountering a new issue with all bright stars in targets I've been imaging the last couple of weeks. The brighter stars have bands or diamond shaped rings with different colors in wave like form around them. Please see attached example of a 10 second image of Rigel. The issue is with 9.5" Edge HD using Hyperstar v. 4, ASI2600MC Pro camera and Antlia Triband RGB Ultra Filer II. I've checked the collimation 3 times using the "out of focus donut shape" method and it appears spot on. I've checked focus with Bahtinov mask and the EAF and it appears good too. I am using a black non-reflective dew shield and have the red LED light from the camera covered in black tape. Any ideas of what could be causing this issue? Could it still be some kind of tilt issue with Hyperstar? Or maybe an issue with the filter (the filter is 'frozen' in its holder in the Hyperstar and I need time to unlock it without damaging it so cannot remove it yet to test)? I've tried shorter subs 10 sec, 30 sec up to 60 sec with gain of 100 - all have the same result.

Any input would be greatly appreciated. Thanks so much for your time and clear skies to all!
Gina

Try it without the filter, and also replacing it with a UV/ir cut filter see the difference test maybe ?

Andrea, above is almost certainly right though

Thank you both. Will try without the filter. At least that sounds like an easy fix!

Well Written Respectful

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