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What is a lens shade/dew shield and why should I use one on my telescope lens?

Telescope Lens

A Lens Shade/Dew Cap is basically a tube that is approximately the same diameter as your telescope tube. It is designed to fit on the front end of the telescope to help reduce the amount of dew that could build up on the corrector plate. It also serves as a lens shade by preventing stray light from hitting the corrector plate, and this can greatly improve the contrast.

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