Quote:
Originally posted by Thiink
Thanks for the reply ausastronomer. I've never noticed it before, but there is already mounting holes for an 80mm fan. The original question is still valid though, should I just mount a fan to that and blow onto the mirror, or should I surround the fan and draw air from the tube.
Thanks. 
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I would get an 80mm Fan from DSE and just mount it to those mounting holes and blow air onto the mirror. The idea of this is to cool the mirror faster so that it reaches thermal equilibrium and the images stabilise more rapidly. This wont help the dew issue and to alleviate that i would mount an extension tube/dew shield to the front of the scope as Ian and I both discussed in an earlier post.
CS-John B