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DJVege - what Paul says is right. You won't be able to use your equipment outside at night when you start dewing up without some dew control methods in place. With a unit like yours that has a corrector plate (such as either a Schmidt-Newtonian or Cassegrain) you can firstly benefit from a wrap-around dew shield (such as in the first photo). Then, as you get more involved, go for a dew heater and controller to gently heat the corrector plate flange that serves to heat the air held within the dew sheild. It only needs to maintain a temperature a couple of degrees above the real ambient air temp to prevent dew from forming.
Cheers - and good luck tonight!
Cheers
Chris
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