Celestron – Dew Shield with Cover Cap – Aluminum Dew Prevention – Fits 11” Schmidt Cassegrain, EdgeHD, and RASA Telescope

Fantastic dew shield! Beautiful design. Fits beautifully. Expensive….., yes. But the best you’ll ever own!

Excellent product I'd recommend for any telescope enthusiast. Great saving by buying through Amazon and speedy delivery even from across the pacific Ocean!!!

I bought this for two purposes: First, during a night of viewing in Western Washington's wet air, this keeps the lens from fogging up on my EdgeHD 11" (which it certainly did without any protection). Secondly, for calibration exposures, especially flats: It is very handy to point the OTA straight up (Zenith), put a few layers of white paper or cloth over the top and an A2 format tracing panel on top of that to sequence a number of "flat" exposures for calibrating the extreme concentric gradient or the SCT in the astro-photos captured in a session. It works great for that. (Make sure to put some Gorilla tape over the cooling light on a ZWO cooled camera and lay some dark paper or cloth over the camera to keep from getting a red reflection glow in your flats. The only caveat is that, for "dark" calibration frames, it leaks light and will require some effort seal off all of the places (around the edges at the OTA and around the cap) that may be leaky. So, for dark frames I just parked the OTA in the horizontal position, unscrewed the camera and capped it, and laid the camera inside the OTA to expose the darks and biases--after waiting for the sensor to cool again.

Fits perfectly. Yet to test the functionality in the field.

Side clips are weak. I used a strap around the Dew Shield and OTA to hold it in place. Disappointing considering the price