I have constructed this dew shield
http://img.villagephotos.com/p/2006-...copedewS03.jpg
http://img.villagephotos.com/p/2006-...copedewS01.jpg
for a C11 out of polycarbonate sheet (bunnings) and some flocking paper I lovingly cannibalized out of another shield I had. Now I am at the stage of fitting a dew heater. I don't want to incorporate it into the shield itself, unless I have to. I was thinking I could make it out of a 30mm wide strip of the poly sheet and size it so that it just slips neatly into the recess in front of my corrector plate here.
http://img.villagephotos.com/p/2006-...copedewS02.jpg
I have 30 1ohm 1watt resistors that I plan to link in series and power off the 12 battery. which will give me (12^2/30) = 4.8 watts of heating power. I read that 3 watts is recommended for a 8" sct so I figured I would bump it up a tad. Since an 8" has area= 201 square inches and my 11" has an area of 380 square inches.
Of course I want to do it NOW!!! But I thought it wise to run it by some others here on the forum, in case there were any issues about heating this part of the scope. Thank you.