[cjmarsh81]

Hello all.

I had the primary mirror out today and while it was out I noticed there is screw threads there ready for me to install a cooling fan. Seeing as it is ready for me to simply screw one on I thought why not. My question is, when you use it do you leave it on? or simply have it on long enough to cool down the primary?

I only ask because I don't know if leaving it on will be detrimental to viewing after the mirror has already cooled enough. Will it make the mirror too cold and then make the image worse?

Thanks