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Effect of dew heater on front element and optical resolution

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I have a Celestron Evolution Nextstar 9.25 and have installed a Celestron ring heater that goes around the outside of the front glass element. I imagine that the temperature of the glass is not even, with the outer diameter being warmer than the center. How does this affect the telescope's resolution at the higher magnifications I use for planets? 

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Good quality glass has a very low thermal expansion. I forget the actual numbers.
You aren't after heating the glass until it is warm or hot. You only need enough to prevent dew formation. A few degrees.
So in conclusion, not a problem.

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