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I would steer clear of hairdryers if you are imaging for the following reasons:-
a) The chance of blowing dust onto the optics which will mess up your flats, because half your images will be clean and after using the hairdryer you will get dust motes on the CC and secondary,
b) Heating up the the affected areas will affect your focus and you will be chasing focus as it cools down.
c) It only lasts for 10 to 15 mins anyway and then you are all dewed up again.
As stated above better to use dew heaters, one near the camera and one behind the secondary, and of course a dew shield.
Cheers
Bill
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