Re: [ATM] 4.5"x 3/4" Pyrex disks at Surplus Shed and Acculap

["Bob May" <bobmay@nethere.com>]

If I bought one of those mirror blanks, I'd do a nice long planetary scope
with it.
You can easily do a F16 (70"FL) or so and get some great views of the
planets with it.  The nice thing is that the parabola is hardly needed to be
found for such a scope as a sphere will do pretty well and be well within
the 1/4 wave criteria for an average scope.  Do the little bit of
parabolization and you will have a scope that will easily view the cusps of
Venus and Mercury when they are in the right aspect.  This from a guy that
has a F45 refractor that views those two planets with great success!
Bob May
bobmay@nethere.com
http://nav.to/bobmay
http://bobmay.astronomy.net

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