how to calculate Exposure Value from astronomical magnitude? The other morning the waning moon was a thin crescent, ~3% llluminated @ -1.7 magnitude. It would have been helpful to...

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how to calculate Exposure Value from astronomical magnitude?

Sep 6, 2021 13:57:14 #

notBert Loc: Ft. Collins, Colorado

The other morning the waning moon was a thin crescent, ~3% llluminated @ -1.7 magnitude. It would have been helpful to calculate what Exposure Value that is to give a starting point for proper exposure.
Also last nite Jupiter was at -2.8 while it Galilean moons varied from 4.8 to 5.9. How can the range in EV for this range in magnitudes be computed? TIA

Sep 7, 2021 09:01:33 #

alberio Loc: Casa Grande AZ

notBert wrote:

I doubt you can get detail on Jupiter and see the moons in one exposure. I just experiment with the settings.

Sep 7, 2021 10:24:08 #

JBRIII

Very interested in answer, but seems to me, there would be too many factors to consider for really accurate answer: camera used, telescope size, sky darkness, filters used or not, etc.

Sep 7, 2021 10:38:07 #

alberio Loc: Casa Grande AZ

JBRIII wrote:

Very interested in answer, but seems to me, there would be too many factors to consider for really accurate answer: camera used, telescope size, sky darkness, filters used or not, etc.

I'm thinking many shorter exposures and stacked would be required to bring them all into one final image.

(Download)

Sep 7, 2021 14:20:26 #

Paul Diamond Loc: Atlanta, GA, USA

Combine two images, one with proper exposure/detail of Jupiter and the other image of the moons of Jupiter (blocking out the overexposure of Jupiter).

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