Quote:
Originally Posted by mccann73
Hi all
I recently purchased a Bintel BT200 f/5 Newtonian scope with an Orion Mini Guidescope and Autoguider, with the cooler months coming I guess I need to start looking at dew heaters, from the controller side I am fine, I can build/mod one for myself, however I am not so certain what I need to protect on the scope, I have read a dew heater on the Newtonian primary is not usually necessary as long as fan is running, but I should have one on the secondary, and heater straps around the eyepiece/camera and ccd guider, sound correct?
Can anyone suggest what type secondary dew heater I would get for this telescope? For the dew straps does anyone have a preference to brand, I see bintel has Kendrick (standard and premier), google turned up Dew-Not Dew which seem to be cheaper or you can make your own, which I am not really interested in doing at the moment. 
Thanks
Andrew
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Andrew
I have almost never had an issue with dew on a primary. Secondaries even in a solid tube can still be an issue and eyepieces.
I use the Kendrick Digifire 7 and it works really well, the ability to select 10% power works perfectly as you only want a tiny amount of heat in a secondary as to much sets up serious air currents and degrades the image. On the secondary on my old 12" I used this
http://www.bintel.com.au/Accessories...oductview.aspx just held in place with a rubber band and the wires running down the spider vane.
Malcolm