#1  
Old 15-09-2020, 06:16 PM
Saturn488 (Chrys)
Registered User

Saturn488 is offline
 
Join Date: Dec 2018
Location: Melbourne
Posts: 117
Image question and Blue/Green Filter

Been capturing a lot of data the last few nights but the clouds and transparency has varied. I have some LRGB shots that are brighter than others (light cloud cover I think).

Does anyone here still use those shots if they are a little bit more exposed?

I am using the LRGB ZWO filters 31mm in a ASI178MM-Cool.

Also I have noticed the blue and green filter are a little darker than the red and lum. Is this due to the wavelength or other issues I might be having.

I am trying to find a monochrome LRGB photo of each channel to see.

Thanks.
Reply With Quote
  #2  
Old 16-09-2020, 02:08 PM
Joshua Bunn's Avatar
Joshua Bunn (Joshua)
Registered User

Joshua Bunn is offline
 
Join Date: Oct 2011
Location: Albany, Western Australia
Posts: 1,221
Hi Chrys.


The lighter and darker exposures are fine to go together in the stack, provided the lighter ones still have a decent S/N ratio... different brightness values will be delt with during normalisation when stacking.


It's quite normal for some filters to be brighter than others, obviously Lum will be the brightest. This can be due to your cameras response to different wavelengths. This to will be sorted out with you RGB combine ratios.



Josh

Last edited by Joshua Bunn; 16-09-2020 at 10:46 PM.
Reply With Quote
  #3  
Old 16-09-2020, 07:38 PM
Saturn488 (Chrys)
Registered User

Saturn488 is offline
 
Join Date: Dec 2018
Location: Melbourne
Posts: 117
Quote:
Originally Posted by Joshua Bunn View Post
Hi Chrys.


The lighter and darker exposures are fine to go together in the stack, provided the lighter ones still have a decent S/N ratio... different brightness values will be sent with during normalisation when stacking.


It's quite normal for some filters to be brighter than others, obviously Lum will be the brightest. This can be due to your cameras response to different wavelengths. This to will be sorted out with you RGB combine ratios.



Josh
Thank you, Josh.
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 05:54 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Advertisement
Limpet Controller
Advertisement
Testar
Advertisement
NexDome Observatories
Advertisement
Bintel
Advertisement
Astronomy and Electronics Centre
Advertisement