|
Chrissyo,
I can take my 12" scope from a warm house to freezing temperature outside and instead of waiting an hour or so for the mirror to cool the fan does it in 5 minutes.
The reason we worry about the mirror temp is because the image gets distorted as the glass slowly changes shape as it cools down. It is a very, very small amount of movement but it is very noticable. The quicker we can cool it to the outside temperature the quicker the image stabilises.
(and it stops the mirror over-heating from Amatuer Astronomers looking around the sky too fast) lol
Last edited by ballaratdragons; 07-03-2005 at 09:32 PM.
|