From: "Stathis Kafalis" 
To: "ATM" 
Cc: "Gottschalk Gert" 
Reply-To: "Stathis Kafalis" 


I updated my webpages and included my experiences on making a 14"
mirror out of a Schott Borofloat of 20 mm (0.8") thickness. If the
pages should  not work temporalily due to high trafic, try the mirror page
http://www.hanf-poos.de//stathis/atm/index.htm. Any comments? Please let me
know, if you see any spelling mistakes or bad English.

Heaving made this mirror, I am wondering, if the limit could be pushed even
fuhrter without discriminating optical performance. For example I noticed,
that the 16" from Adrie
http://home.planet.nl/~asuyker/nvws/frames/my_ultralight_dobsonian.htm is
just 22 mm thick. Who else did such thin mirrors and what where the issues
involved with it. Do this mirrors deliver really fine images, or is it a
compromise between optical quality and weigth?

Stathis Kafalis
http://www.geocities.com/dobsonstathis

--- BBBS/NT v4.00 MP