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- Dew Shield is compatible with all 11" optical tubes
This model is compatible with all 11" optical tubes from Celestron and Meade.
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 Lens Shade by preventing stray light from falling on the corrector plate, which greatly improves contrast.