Quote:
Originally Posted by Rac
That mirror looks interesting!
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I chose this type for it's advanced thermal cooling properties and light weight. Active cooling via an exhaust fan in the cap then passive via the hole in the centre should keep the mirror very close to ambient all night. That is why the tube is so large it is 100 mm larger than the mirror but very light using 1.1mm aluminium sheet. We will see.
http://www.normandfullumtelescope.co.../large-mirror/