Old 10-04-2012, 09:57 PM
Registered User

Carl is offline
Join Date: Apr 2006
Location: Alans Flat
Posts: 373
CWB for modded DSLR

Would a A) grey card or B) White card imaged at noon give more accurate star colours when set as the CWB for astro imaging with a modified DSLR camera? And C) would this have an adverse effect when trying to capture the red in emmission Nebula?
It is suggested on the grey card manufacturers guide sheet that grey card is around 1 to 2 stops darker when imaging at low light.

Any suggestions?

Carl Rainer
Reply With Quote
Old 11-04-2012, 01:27 PM
gregbradley's Avatar
Registered User

gregbradley is offline
Join Date: Feb 2006
Location: Sydney
Posts: 16,347
Photographic 18% grey card imaged in sunlight around midday gives accurate white.

Reply With Quote
Old 11-04-2012, 05:36 PM
Merlin66's Avatar
Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 7,856
The CWB is for daylight shots of the family.
No need to use it when doing astro imaging.
The image needs to be saved as a RAW file and processed across the RGB channels.
Reply With Quote


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 01:14 PM.

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