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The light falling on the corrector will be the same wether you have a dew shield or not as you look right ahead. The contrast will be greatly increased because stray light won't reach the corrector plate as it will be deeply nested half way into the whole tube. You'll still need to heat it because when you're pointing up it will get very cold very quickly. I have an electric wire around he steel rim that I feed 12V to. Keeps me out of trouble. Doesn't have to be very warm. Just above the dew point is all you need.
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