Quote:
Originally posted by ausastronomer
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
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I'm going for a drive to DSE tomorrow (I have to go to Orange, they closed our DSE down here in Bathurst..
). Whats the best way to feed the fan the required 12v? I could use one of the DSE 8x AA battery holders and use rechargeable batteries, but that only gives off 9.6v. I know the fans work on lower voltages, albeit at slower speeds, but is that going to be enough to cause enough CFM to be useful? What size/quantity of batteries does the factory fan use? I noticed the Orion branded fan/battery packs run 8x D sized batteries, ouch!
The only other thing I am going to need is a plug so I can disconnect the fan so I don't eventually crush the wires when I sit the tube on the floor inside the house while I am packing up.