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Mike,
I would be attacking the problem a little differently.
I would be getting some "dew heater straps" and attaching these to the inside of the tube with velcro, just above the primary mirror level. This will prevent the air above the mirror reaching "dew point". I would start by using 2 small straps designed for 1.25" eyepieces and placing these on opposite sides of the tube.
In terms of this having an effect on image quality? I don't think it will.
CS-John B
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