Quote:
Originally Posted by N1
I may be wrong here, but aren't the exit pupil and magnification at a given exit pupil in a linear relationship with the aperture? If that is the case, then the 25" would show the same object at the same apparent brightness just under 1.4 times bigger that the 18"
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Mirko - you are absolutely right of course - if your pupil is exactly filled by the telescope , the Eta Carina nebula for example has exactly the same surface apparent brightness with the naked eye as it does in a 2 meter telescope - only the magnification and resolution changes
When people get this they have an `aha ' moment in their understanding of how telescopes work.