New Narrowband Filers

Focusers, Filters, Barlows etc..

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davebl
Posts: 18
Joined: Tue Mar 21, 2017 7:55 pm

New Narrowband Filers

Post by davebl » Fri Mar 22, 2019 4:16 am

I just purchased a set of the new narrowband filters in hopes of reducing the halos around bright stars. I'm happy to say that the H Alpha and SII filters work really good. A real improvement. Unfortunately, the OIII produces awful halos. The OIII from my original set works quite well, so between the 2 sets, I have I have 1 good set. My question is should the new OIII filter produce such bright halos? I tried it with what I thought was the correct side facing the camera, and then reversed it just in case. No difference.
Dave

davebl
Posts: 18
Joined: Tue Mar 21, 2017 7:55 pm

Re: New Narrowband Filers

Post by davebl » Fri Mar 22, 2019 7:14 am

By the way, I am using the ASI1600MM Cool w/ 31mm filters.

https://www.flickr.com/photos/79487516@ ... ed-public/

Dave

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Sean.Wang
Posts: 675
Joined: Mon Apr 24, 2017 10:08 am

Re: New Narrowband Filers

Post by Sean.Wang » Mon Mar 25, 2019 7:18 am

OIII filter is not like Ha or SII, it's can't use the RED glass base to control the halos. So it would have some Halos around bright stars.
Set up in right way will reduce the halos, but still can't control the halos as good as Ha and SII filter.
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