Quote:
Originally Posted by Saturnine
Thanks Martin
I think I may have to correct you , Mars has a very high surface brightness, hence why a small object in apparent size is so bright. Think of a planetary nebula of similar apparent size, like NGC 7009, the Saturn Nebula, at 20" X 15" is only mag 8 and for a planetary has a reasonably high surface brightness. That is also why it is possible to achieve high frame rates when imaging Mars, because it is so bright, looking at the planet for too long in an eyepiece with a larger aperture doesn't do your dark adaption any favours.
Cheers.
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Jeff
Thanks for the correction
I would have assumed that the red / orange colour of Mars would have a lower rendering index on the light spectrum than say the blues to yellows to whites
I’m probably using my commercial lighting background as a rule of thumb which is a no no . Artificial lighting behaves totally different than celestial light
Cheers