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Astrodon 3nm OIII halos

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#1 Synon

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Posted 01 December 2022 - 02:19 AM

I'm using a WO Star71 with a QHY268M and Astrodon 36mm filters. H and S filters seem to have virtually no halo, but the OIII is pretty intense. I tried reversing the filter but that had no effect, the black edging around the filter seems intact, and I put in the buckeyestargazer 3d printed masks for good measure too. I know these are some very bright stars, but even my california nebula had star halos, seems like these will be very troublesome to fix in post. Is this normal for premium filters??? Could something else be causing it in my optical train?

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  • m42 o resize.jpg

Edited by Synon, 01 December 2022 - 02:20 AM.


#2 Synon

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Posted 01 December 2022 - 02:22 AM

Here is the Ha for comparison, which look great.

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  • m42 ha.jpg


#3 andysea

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Posted 01 December 2022 - 06:34 AM

I have the same filter. I found it to be generally well behaved but bright stars can cause halos, I don't do much NB so I never investigated further. 
This image that I took in  2015 shows an Oiii halo. My Astrodon filters are fairly old, probably from 2012 or so.

21996364466_0a82213138_c.jpgIC59 by Andy Ermolli, on Flickr



#4 Tapio

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Posted 01 December 2022 - 06:50 AM

I believe/hope the newer versions are better.




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