[ATM] Mirror Regrind.

[burrjaw at earthlink.net (Jim Burrows)]

At 2004-02-06 00:09 +0000, Marco Miglionico wrote:

>Some of you may recall my post on the 12in F3.3 (paraboloidal)
>Mirror that I acquired (ex-military). I tried a 3in flat with it and do not
>like seagulls. The mirror isn't perforated and I don't want to go down the
>coude
>or nasmyth roads! So i'm going to regrind.(F8 plantary scope would be nice)
>
>Here's the dilema: Do I
>1/  Regrind the F3.3 face
>2/ Flip it over and grind the flat rear face?

If that's a good 12"f/3.3 parabola, them fella's hard to make, and they 
make Grreeat! cassegrains.  Consider getting it perforated and start the 
challenge of making a secondary for it (formulas in Texereau, p. 139 on).

         -- Jim Burrows
         -- mailto://burrjaw@earthlink.net
         -- http://home.earthlink.net/~burrjaw
         -- Seattle N47.4723 W122.3662 (WGS84)