Celestron Deluxe Flexible Dew Shield, 9.25" - 11" (94016)

Flexible Dew Shield for 9.25-11” Edge HD

SCTs are notorious for fogging of the front corrector plate. I have tested the flexible dew shield for my new 11” Edge HD in the last month and compared the scope with and without the dew shield on comparable nights, both at 15-16°C over night with dew point of 11°C. At the end of 2 hours of observing near the zenith without the dew shield, when light dew had collected on my observing table and charts, the corrector plate was starting to fog up, not heavy dew but starting to degrade the image at the eyepiece. The next night with the dew shield attached, observing in similar high altitude areas of the sky, again with mild dew collection, the corrector plate remained completely clear. The benefit of using the dew shield seemed pretty clear. I expect to use a Dew Heater for colder nights and all-night observing but the dew shield does appear to work well for average observing.