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I'm not convinced by this answer. There's no reason that 30x80 binoculars need to be significantly bigger than 20x80s, which are popular. And 30x80s certainly show much fainter objects, and much more detail in bright objects, than 20x80s.

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Thank you Tony for this post. This is starting to make some sense to me now. The exit pupil with a very comfortable 9mm plossl on my F6 dob would be 1.5mm correct? So I am already agreeing without knowing it that an exit pupil less than 5mm is comfortable. The difference is in the dob I am at 133x instead of 30x. On my 130ST (F5) at 26x (25mm) I am at 5mm exit pupil. But I am limited to one eye viewing.

Now to help me understand further what is the visual difference between a 30x80 with two eyes observing and my F6 scope at 26x? It probably isn't that simple a question but considering similar quality can you offer some thoughts?

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Hardin DSH-8
Orion SpaceProbe 130ST
11x56 Oberwerk
7x35 Jason (don't laugh - you'll hurt its feelings)

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