[sac-forum] Re: Diagonal Size

On Tue, 7 Jan 2003 17:20:41 -0700, Matt Luttinen wrote:

> BTW, I am looking at an EP height of 99" at the zenith. Ouch! Just like
> a 20" f5. It doesn't seem too high until you get out the tape measure.

Don't forget to subtract the shortening due to the secondary.  An average
person might be just two to three feet off the ground.  This is why fast
optics tend to be prefered.

Is this going to be for planet viewing?

        -Paul

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