Celestron NexStar 11, C-11 & CPC 1100 Dew Shield
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This model is compatible with all 11" optical tubes.
A dew shield is a tube, of approximately the same diameter as your telescope tube, designed to fit on the front end of the telescope to reduce the amount of dew that builds up on the corrector plate. It also serves as a Len Shade by preventing stray light from falling on the corrector plate, which greatly improves contrast.