Mak Newt Question

Greetings A-Marters,

I have a question for you thermal experts out there: I'm finishing up a 7.1" F6 homemade Mak Newt (Russian optics), using a 9" OD rolled aluminum tube. The corrector cell end of the scope is not ventilated, but the primary mirror end is open to the air (no fan). Should I line the inside of the tube with anything like cork, flocking, etc.?

Thanks very much,

Brian

To my thinking, the ideal situation would be
to insulate the tube (cork, etc.) against
body heat. But you will also need to
use a fan to cool the scope then -- drawing
air through the tube - opening at one end
and fan at the other.

If you insulate and have no fan. it will just
extend the cooldown time.

I have tested a 6" Russian Mak-Newt (no
insulation) on an optical bench, and I
can see thermal aberrations from my
standing next to it looking in the eyepiece.
And thats at room temperature.