Update on Yolo Reflectors

["Mark VandeWettering" <markv@tick>]

I added a link about grinding mirrors for Yolo reflectors to my 
webpage:
        http://pixwww.pixar.com/markv/export/telescopes.html

The original is in German, with an english abstract, I will try to 
produce a condensed version of it in English sometime soon.  Basically
the idea is to warp the mirror while finegrinding/polishing, so that it 
assumes the appropriate toroidal shape when the pressure is released.

One bug I found, he lists the focal length of the 6" secondary for the 
10" design as 560mm.  A little math will show that it should be closer
to 5600mm.   I have notified the author.

                Mark 

-- 
Mark T. VandeWettering                  Telescope Information (and more) 
Email: <markv@pixar.com>                http://webspace.com/markv/
       <markv@webspace.com>             Clear Skies!