> Date: Sat, 25 Aug 2001 12:44:48 -0700
> Subject: [M]: Curious Question on F-Stop (not sure if this is the
name) but F/10, F6.3 etc.

We lost the rest of your question, but yes, f-ratio means the same thing
on telescopes as on camera lenses. It is the focal length divided by
the aperture. The difference is, with telescopes it isn't adjustable.
But if you put a camera body of the prime focus of the telescope, it is
indeed working at f/6.3, f/10, or whatever, and the exposures of daytime
objects will be the same as with a lens at that f-ratio.

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