|
Yeah, it’s a little counter-intuitive isn’t it? Reading more and more, I now understand the following to be true - I think!
When imaging a galaxy through a 12” F10 scope versus an 8” F10 scope, you could be forgiven for believing that the 12” image would automatically record the galaxy to be brighter than in the 8”.
But, they would record as the same brightness in either scope. The main difference is that the 12” (FL of 3000mm) would have a narrower field of view versus the 8” (FL of 2000mm), and thus the galaxy would be captured at a larger scale (more magnified) in the 12”, but of the same brightness.
However, visually, at the same magnification, the bigger light bucket will make the galaxy appear brighter if your eye can accommodate the full exit pupil of the eyepiece.
Cheers
Dennis
|