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Old 24-04-2021, 01:27 PM
RugbyRene (Rene)
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A question about the L-Extreme filter & ASI294

Hi all,

I have a couple of questions for the community regarding images I took with my ASI294MC Pro and L-Extreme filter. I've read that the 294 doesn't do that well with HA.

I've attached the image which is a stack of 50 light frames taken at gain 121, offset 30 and 180sec each. No calibration frames have been added (yet).

My questions are:

1. Is the haloing around the two brightest stars normal with this filter?
2. There's what looks like HA nebulosity on the left hand side of the image. Is this normal?

Apologies for the basic questions but I've only used a LPR filter up to now, so am finding my way with this new filter.

Many thanks.

Rene
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Old 24-04-2021, 02:15 PM
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multiweb (Marc)
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1- could be a reflection on your camera window. Increasing the spacing between filter and chip can help

2- although it's uncalibrated the nebulosity and dark patch look legit.
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Old 24-04-2021, 02:29 PM
RugbyRene (Rene)
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I did a quick search and apparently it’s due to the Oiii channel (which makes sense as it has a teal colour to it). Apparently it can be processed out of the images. If I split the channels I don’t see it in Ha.

Quote:
Originally Posted by multiweb View Post
1- could be a reflection on your camera window. Increasing the spacing between filter and chip can help

2- although it's uncalibrated the nebulosity and dark patch look legit.
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Old 24-04-2021, 03:23 PM
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Nikolas (Nik)
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Haloing is normal for this filter I usually process it out, it's a great filter otherwise
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Old 24-04-2021, 03:24 PM
RugbyRene (Rene)
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Quote:
Originally Posted by Nikolas View Post
Haloing is normal for this filter I usually process it out, it's a great filter otherwise
That’s what I read. I’m loving the filter so far. So much detail.
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Old 24-04-2021, 10:21 PM
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Karlz (Karl)
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The haloing is from the focus not quiet there, I had the same problem when I got my L-extreme and didn't work it out till processing.
As I can see in your sig you use a foucuscube2 as I do, since I've gotten it all haloing issues have gone.
I'm not sure on what capturing program you use but for the moment I'm using NINA with great results, my auto focus numbers for it are as follows, hope this helps.

Karl
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Old 25-04-2021, 06:32 AM
RugbyRene (Rene)
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Quote:
Originally Posted by Karlz View Post
The haloing is from the focus not quiet there, I had the same problem when I got my L-extreme and didn't work it out till processing.
As I can see in your sig you use a foucuscube2 as I do, since I've gotten it all haloing issues have gone.
I'm not sure on what capturing program you use but for the moment I'm using NINA with great results, my auto focus numbers for it are as follows, hope this helps.

Karl
Hi,

I don’t think it’s my focussing. As you said I’m using the Pegasus Focus Cube 2. I use KStars and usually do 2 auto-focus routines (it’s recommended) before imaging so I’m pretty sure my focussing is as good as it can be.

Rene
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Old 25-04-2021, 09:49 AM
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Nikolas (Nik)
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Nah it's not focus, I only see the haloing in my ed72 but not when using the TS 130.
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Old 25-04-2021, 11:58 AM
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I don't use a refractor, hence why I mentioned focusing.
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Old 26-04-2021, 03:34 PM
AdamJL
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It's in my images (80ED) with this filter.
I don't mind the halos. It's like star crosses for me. Personal preference
Maybe one day I'll learn how to remove them, but it looks okay.
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Old 27-04-2021, 06:03 PM
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I get a bit of haloing around the O3 with this filter. Maybe not as much as that. My filter is a long way away from the camera.

Agree, the Ha is legit. It's got shape !
The dark bit. Don't know if it's a dark neb, a dust bunny or a crazy bird in a nearby tree.
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