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Diffuse halos around bright stars with narrowband filters

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#1 jmarik

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Posted 27 January 2021 - 09:40 AM

Hello,
I use UltraBlock and Lumicon OIII filters with XT8 dobsonian (visual only). The filters work great on nebulas. But I noticed diffuse halos around bright stars (e.g. Rigel) with them. Is that normal? Would flocking the tube provide any help?
Thanks.
Jan

#2 ngc7319_20

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Posted 27 January 2021 - 11:37 AM

This could be caused by slight roughness in the filter coatings / layers.  It is like looking through a slight fog.  I have not noticed it on Lumicon filters, but your eyesight might be better than mine.

 

Flocking will not help it.



#3 SloMoe

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Posted 27 January 2021 - 11:42 AM

most likely a little bit of moisture or dust in your air.


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