HEATERS
You may build your own heaters using my Home-made Heater instructions or you may use any commercial heater strip which runs on 12V and has an RCA plug. Here are a few sources:  
MANUFACTURERWEB SITENOTES
Dew-Not
CLICK LINK TO
LEAVE WWW.DEWBUSTER.COM
AND GO TO
www.dew-not.com
 
All are compatible.
Kendrick
CLICK LINK TO
LEAVE WWW.DEWBUSTER.COM
AND GO TO
www.kendrickastro.com
All are compatible.
Astrozap
CLICK LINK TO
LEAVE WWW.DEWBUSTER.COM
AND GO TO
www.astrozap.com
All are compatible.

WHAT HEATERS WILL I NEED?


Schmidt-Cassegrain
You will always need a heater on the Corrector Plate and it should be placed around the main tube just BEHIND the Corrrector Plate Casting (NOT around the casting or the dew shield) so that heat enters the tube and warms the Corrector Plate from the inside. It is advisable to use a Temperature Sensor on the Corrector Plate Heater for best optical performance of the telescope. The eyepiece will need heat but I recommend putting the heater around the Star Diagonal because it will make it easier to change eyepieces and store heat warming the eyepiece faster. If you only use the finder for initial star alignment then you can just keep the caps on it, otherwise use a heater on the finder objective and a 0.965" heater on the eyepiece. If you have a guidescope, you can usually run its objective heater and eyepiece heater on a Medium Power output, but if you use it for observation then a Temperature Sensor on the objective will provide improved optical performance.


Refractor
You will need a heater on the Objective Lens and it should be placed around the main tube just BEHIND the dew shield so that heat enters the tube and warms the objective from the inside. It is advisable to use a Temperature Sensor on the Objective Lens Heater for best optical performance of the telescope. The eyepiece will also need heat, but I recommend putting the heater around the Star Diagonal because it will make it easier to change eyepieces and the Star Diagonal will store heat energy and when you change eyepieces it will warm the eyepiece faster. If you only use the finder for initial star alignment then you can just keep the dew caps on it, otherwise use a heater on the finder objective and a 0.965" heater on the eyepiece. A guidescope's objective heater can be run on a Medium Power output, but if a piggybacked scope is used for high-power observation then use a Temperature Sensor on the objective heater for best optical performance.


Newtonian Reflector
You do NOT want to use a heater on the Primary Mirror because it needs to cool to the air temperature to form sharp images. If your Primary Mirror is dewing up then install a fan blowing on the back side of the Primary Mirror to keep the mirror close to air temperature. If you do not wish to install a fan then use a portable fan behind the telescope blowing air at the mirror. On smaller Newtonians a dew shield can be made to extend the tube. This will shield the diagonal and is often enough to prevent dew. On larger Newtonians it is usually necessary to install a heater on the secondary mirror. If you have an AstroSystems DewGuard then it has a built in controller so it needs to be powered with steady 12V such as the 12V Output jack of the DewBuster™ Controller.  All other heaters should be powered from one of the DewBusterâ„¢ Controller's Temperature Controlled Outputs and used with a Newtonian Temperature Sensor.


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