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Web Result

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AstroSystems DewGuard Instructions The DewGuard is the first temperature controlled heating system designed to help prevent dew formation on a telescope's secondary mirror. The uniform distribution and controlled heating avoids air currents and optical distortion. Newtonian telescopes in the 6" to 36" range can experience condensation on their secondary mirrors. This may be due to the open structu...

http://www.astrosystems.biz/dginst.htm

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