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It may sound contrary to the belief (and mathematics) of what is written above, but I see more nebula in a 2" widefield 30mm than I do in a 1.25mm 30mm plossl! But that could come down to quality of the optics as well.
The theory of light being spread over a larger area being slightly fainter makes sense, but also remember that the eye's pupil has a certain size, and an image larger than this, (exit pupil?) will be dimmer as a percentage isn't even entering the pupil.
Others may help with the exit pupil numbers.
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