#1  
Old 30-04-2022, 04:01 PM
Mickoid (Michael)
Registered User

Mickoid is offline
 
Join Date: Feb 2016
Location: Melbourne, Australia
Posts: 1,439
Centaurus A

While no where near as good as the two posts of this object below me, I'm still amazed at what the ASI224mc can achieve on Deep Sky targets. This one I shot last weekend with a 6 inch Newt from Bortle 6 skies. The camera or Sharpcap did do some weird things to the 45 x 2min subs I took. There were some strange gradients to work on, some Amp Glow and they were stretched to a yellow colour cast which I initially couldn't remove. I opened the subs up in ASI Studio and they looked washed out and yellow. I reset the ASI Studio histogram and the subs looked completely normal. When I saved the sub with the reset histogram as a .tif file, it changed to mono with a very obvious matrix background. So I saved it as .png file to see if there was a difference and bingo, the .png file showed normal colour bayered characteristics. So I did this to all 45 subs and then saved them back to 16 bit .tif files in Photoshop for stacking in DSS. Very time consuming. My M83 I shot on the same night had none of these problems at all, so something changed in the settings when I shot NGC 5128 that I was unaware of. Oh well, you live and learn as they say!
Attached Thumbnails
Click for full-size image (CentaurusA_6inchNewt.jpg)
204.6 KB103 views
Reply With Quote
  #2  
Old 30-04-2022, 05:12 PM
RyanJones
Registered User

RyanJones is offline
 
Join Date: Jun 2018
Location: Melbourne,Australia
Posts: 1,439
A good effort Michael.

May I suggest if you are not using flats, they will help you with your gradients.

Also this is quite cropped but there is evidence of coma across the top of the image. Are you using a coma corrector ?

Well done for your efforts so far keep going !
Reply With Quote
  #3  
Old 30-04-2022, 07:09 PM
Mickoid (Michael)
Registered User

Mickoid is offline
 
Join Date: Feb 2016
Location: Melbourne, Australia
Posts: 1,439
Thanks for the response and the advice Ryan. Yes, in future I will shoot flats with this camera. It will be interesting to see what difference it makes with such a tiny sensor so I'll give them a go next time I use it. No CC used either, I thought the tiny sensor would not include any of the peripheral aberrations of the 6 inch mirror but it is an f5 scope and has obviously shown a CC is needed for this uncropped image.
Reply With Quote
  #4  
Old 30-04-2022, 07:46 PM
RyanJones
Registered User

RyanJones is offline
 
Join Date: Jun 2018
Location: Melbourne,Australia
Posts: 1,439
Quote:
Originally Posted by Mickoid View Post
Thanks for the response and the advice Ryan. Yes, in future I will shoot flats with this camera. It will be interesting to see what difference it makes with such a tiny sensor so I'll give them a go next time I use it. No CC used either, I thought the tiny sensor would not include any of the peripheral aberrations of the 6 inch mirror but it is an f5 scope and has obviously shown a CC is needed for this uncropped image.
Wow ! Uncropped ! That is a tiny sensor ! It’s unfortunate that it didn’t escape the coma then. Well done
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 06:43 PM.

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