SII filter reflections

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SII filter reflections

Postby dansemacabre » Tue Oct 17, 2017 1:06 pm

I recently obtained a brand new ASI1600 set with EFW and 36mm unmounted LRGB+narrowband filters. All filters works perfectly and more or less parfocal, except the SII which makes a terrible reflections on all stars with magnitude 7 and less. I tried to unscrew EFW and place the filter upside down, but there's no change.
Do anyone else have this experience?
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Re: SII filter reflections

Postby Sam » Wed Oct 18, 2017 10:30 am

you can try to reverse the order you connect the EFW
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Re: SII+OIII filter reflections

Postby dansemacabre » Thu Oct 19, 2017 11:01 am

There's no change. Filter orientation apparently doesn't matter. Here are my results with OIII and SII filters - terrible reflection on 7,5mag stars, which is not acceptable for me :( Is it normal or there's a possibility that filters are possibly defect somehow?

Image
Image
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Re: SII filter reflections

Postby Sam » Fri Oct 20, 2017 8:50 am

actually, it's not very bad from our point of view

if change order won't fix, then there is no way
this reflection is optics related too
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Re: SII filter reflections

Postby dansemacabre » Tue Oct 24, 2017 3:15 pm

There is no such problem with Ha or LGRB filters. And there is no such problem with other same priced filters from different company (which also causes reflection, but for stars 1,5mag brighter, not for 7,5mag!). Can it be just possible I had a bad luck about this particular pieces?
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Re: SII filter reflections

Postby Rojoyinc » Sun Nov 05, 2017 9:07 pm

What do you mean by reflections? do you mean the donuts around some of the larger stars? I get those and figured they were due to over exposure of those brighter stars? Else I don't see what you're referring to? (I'm fairly new to this and interested in learning?)
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