#21  
Old 01-10-2020, 12:32 PM
Atmos's Avatar
Atmos (Colin)
Ultimate Noob

Atmos is offline
 
Join Date: Aug 2011
Location: Melbourne
Posts: 6,980
This image of the Orion Nebula shows several stars that exhibit the microlens diffraction pattern with a QHY163M, most notably is the brighter star towards the lower right of the frame.
There is also some ringing artefacts around the stars. I've estimated them to be the "out of focus" version of the star at about 0.6mm of defocus. This means it's a reflection half that distance so 0.3mm or the glass cover slip over the sensor.
Reply With Quote
  #22  
Old 01-10-2020, 01:15 PM
Stonius's Avatar
Stonius (Markus)
Registered User

Stonius is offline
 
Join Date: Mar 2015
Location: Melbourne
Posts: 1,494
Quote:
Originally Posted by Atmos View Post
This image of the Orion Nebula shows several stars that exhibit the microlens diffraction pattern with a QHY163M, most notably is the brighter star towards the lower right of the frame.
There is also some ringing artefacts around the stars. I've estimated them to be the "out of focus" version of the star at about 0.6mm of defocus. This means it's a reflection half that distance so 0.3mm or the glass cover slip over the sensor.

So is it a problem with all sensors then? Or how is it best avoided?


Cheers


Markus
Reply With Quote
  #23  
Old 01-10-2020, 01:48 PM
Atmos's Avatar
Atmos (Colin)
Ultimate Noob

Atmos is offline
 
Join Date: Aug 2011
Location: Melbourne
Posts: 6,980
Quote:
Originally Posted by Stonius View Post
So is it a problem with all sensors then? Or how is it best avoided?


Cheers


Markus
The QHY163M is the QHY version of the ASI163MM, both have the same Panasonic sensor.
Reply With Quote
  #24  
Old 01-10-2020, 02:30 PM
Imme (Jon)
Registered User

Imme is offline
 
Join Date: Aug 2017
Location: Kyneton
Posts: 840
Quote:
Originally Posted by sunslayr View Post
I've grabbed a cropped sub from the blue filter it shows the grid a bit better, it's definitely not an obstruction, the star probably isn't bright enough to really show it. I can also agree that the 294mc is not without its issues but with the 1600 sensor being discontinued it will soon be the only new option. Is there a way of using something like a layer mask to fix microlensing? I've had some success with the clone tool but I admit my photoshop/gimp experience is fairly limited.
Asa confirmation i get the exact same pattern on my ASI1600 Pro using ZWO LRGB filters on exactly the same star when imaging the same area.......could almost say that pic is one of my frames.

How to fix it.......clone tool!
Reply With Quote
  #25  
Old 01-10-2020, 08:14 PM
multiweb's Avatar
multiweb (Marc)
ze frogginator

multiweb is offline
 
Join Date: Oct 2007
Location: Sydney
Posts: 22,060
Found an interesting post on CN
https://www.cloudynights.com/topic/6...ect-explained/
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 11:59 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Advertisement
Testar
Advertisement
Bintel
Advertisement