Celestron Flexible Dew shield for 11-Inch SCT TelescopesThis Dew shield is slightly bigger in diameter than the outside diameter telescope tube, designed to fit on the front end of the telescope to reduce dew that builds up on the corrector plate. It also acts like lens shade, preventing stray light from falling on the corrector plate.This model is compatible with Celestron 11-inch aperture SCT optical tubes.T
A good fit but...
The dew shield was adequate but dew still got on the scope with about 60-70% humidity. You will still need a dew heater strip for the telescope or a hairdryer if you've got AC close by....