Go Back   IceInSpace > Beginners Start Here > Beginners Astrophotography

Reply
 
Thread Tools Rate Thread
  #1  
Old 24-04-2021, 02:27 PM
RugbyRene (Rene)
Registered User

RugbyRene is offline
 
Join Date: May 2015
Location: Sydney
Posts: 259
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
Attached Thumbnails
Click for full-size image (masterLight-BINNING_1-FILTER_NoFilter-EXPTIME_180.jpg)
202.3 KB74 views
Reply With Quote
  #2  
Old 24-04-2021, 03:15 PM
multiweb's Avatar
multiweb (Marc)
ze frogginator

multiweb is offline
 
Join Date: Oct 2007
Location: Hinchinbrook
Posts: 20,667
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.
Reply With Quote
  #3  
Old 24-04-2021, 03:29 PM
RugbyRene (Rene)
Registered User

RugbyRene is offline
 
Join Date: May 2015
Location: Sydney
Posts: 259
I did a quick search and apparently itís 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 donít 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.
Reply With Quote
  #4  
Old 24-04-2021, 04:23 PM
Nikolas's Avatar
Nikolas (Nik)
Dazed and confused

Nikolas is offline
 
Join Date: May 2012
Location: Melbourne
Posts: 2,126
Haloing is normal for this filter I usually process it out, it's a great filter otherwise
Reply With Quote
  #5  
Old 24-04-2021, 04:24 PM
RugbyRene (Rene)
Registered User

RugbyRene is offline
 
Join Date: May 2015
Location: Sydney
Posts: 259
Quote:
Originally Posted by Nikolas View Post
Haloing is normal for this filter I usually process it out, it's a great filter otherwise
Thatís what I read. Iím loving the filter so far. So much detail.
Reply With Quote
  #6  
Old 24-04-2021, 11:21 PM
Karlz's Avatar
Karlz (Karl)
Registered User

Karlz is offline
 
Join Date: Jan 2021
Location: Lake Macquarie
Posts: 144
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
Attached Thumbnails
Click for full-size image (Screenshot 2021-04-24 231802.png)
48.1 KB25 views
Reply With Quote
  #7  
Old 25-04-2021, 07:32 AM
RugbyRene (Rene)
Registered User

RugbyRene is offline
 
Join Date: May 2015
Location: Sydney
Posts: 259
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 donít think itís my focussing. As you said Iím using the Pegasus Focus Cube 2. I use KStars and usually do 2 auto-focus routines (itís recommended) before imaging so Iím pretty sure my focussing is as good as it can be.

Rene
Reply With Quote
  #8  
Old 25-04-2021, 10:49 AM
Nikolas's Avatar
Nikolas (Nik)
Dazed and confused

Nikolas is offline
 
Join Date: May 2012
Location: Melbourne
Posts: 2,126
Nah it's not focus, I only see the haloing in my ed72 but not when using the TS 130.
Reply With Quote
  #9  
Old 25-04-2021, 12:58 PM
Karlz's Avatar
Karlz (Karl)
Registered User

Karlz is offline
 
Join Date: Jan 2021
Location: Lake Macquarie
Posts: 144
I don't use a refractor, hence why I mentioned focusing.
Reply With Quote
  #10  
Old 26-04-2021, 04:34 PM
AdamJL
Registered User

AdamJL is offline
 
Join Date: Sep 2010
Posts: 515
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.
Reply With Quote
  #11  
Old 27-04-2021, 07:03 PM
ChrisV's Avatar
ChrisV (Chris)
Registered User

ChrisV is offline
 
Join Date: Aug 2015
Location: Sydney
Posts: 1,556
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.
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 09:13 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Advertisement
Testar
Advertisement
Bintel
Advertisement
Limpet Controller
Advertisement
NexDome Observatories
Advertisement
Astronomy and Electronics Centre
Advertisement