Celestron 94021 Aluminium Telescope Dew Shield with Cover Cap, Fits 8” Schmidt Cassegrain, EdgeHD, and RASA telescopes

I’m very pleased with the fit. Perfect alignment and easy engagement. It seems very secure on my NexStar 6se OTA. Had it out this morning and had no light leak issues. It’s worth the money spent. I’ll get one for my next larger scope.

I have various SCTs including 8", 11", and a 14". This by far is the most well designed dew shield I have owned for those scopes. It is stiff enough so will hold up to some abuse, I like the side port to run cables out as use it in Hyperstar mode so need to get the camera USB, power, and also the internal Celestron dew heater ring cables out of the shield. It fits well and the clamping mechanism is good. One big plus is that they include a nice aluminum cover. Since the stock cover won't fit on the dew shield I always had to make my own caps for my other scopes which is a pain. I could remove the dew shield on the other scopes and use the stock cover but that is an issue with Hyperstar as I do NOT want to remove the camera, Hyperstar, etc. every time I want to cover the scope after using it. I haven't found any negatives although I did decide to put some Rrvnuts with plastic thumb screws on the dew shield so I could ensure a tight and secure fit so it wouldn't get knocked off as I covered the scope for the night. The stock clamping setup is pretty good but I wanted the extra peace of mind ;-)

GOOD QUALITY

1. Great: Adjustable so it can clip on your 6SE. 2, Great: It is very good at slowing dew penetration. 3. Great: Also, it works with the new, Dew Ring! 4. Annoyance: One issue - The top cover (when mounted) fits snug onto the top of the Dew Shield. The top of the dew shield has a rubber ring. That ring is VERY snug and makes removing the Dew Shield cover (without removing the ring!) a pain. It works, but given that everything else is perfect, this is just ok! RECOMMENDED! YES I would buy this again for sure!

Works well enough as a dew shield. I do like the side port for the dew heater ring, and it does allow enough room for camera cables when using a Hyperstar 4. The Hyperstar was my main reason for purchasing this dew shield. Since it has a dust cap, it allows me to leave the hyperstar attached and not have to worry about dust on the corrector plate. Fitment could have been a little better. There are lots of gaps around the edge that let in light. Which ruins dark frames. You will definitely have to cover those. And if you're running a cooled camera for dark frames with the hyperstar, heat can't dissipate with the end cap on. So you'll have to watch that carefully. Other than those couple things, it works great and it looks nice as well.

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.

It snaps onto my 8 inch nexstar+ telescope perfectly and the felt inside keeps reflection out. Waited a long time for this type dew controller. Works great with my R-Sky dew bands and controller along with the corrector dew ring which i power if off my med power from the R-Sky automatic controller.

As a shield I suppose this works fine. However, I can’t get past the $250 price tag in view of two flaws that make me wonder about the competency of Celestron designers - and managers that approve designs. The first is just sort of annoying and relates to the front cover. It has a very shallow lip and no handle so to get it off you pretty much pry it with your fingertips or nails. It doesn’t take much to lose your grip on the thing and have it fall on the ground. So far this has only caused unsightly scrapes but one presumes that dents are in its future. A side effect is that you can easily pull off the plastic/rubber seal at the end of the tube since it is flush with the cover lip. The serious problem is with the way this shield mounts to the telescope. It has two plastic tabs that are supposed to snap into place behind the plastic rim of the telescope. Well, it does a really stinky job doing that, despite adjustments suggested by the enclosed instruction sheet. I am guessing that winds over a couple of miles per hour would blow this baby off, resulting in substantial damage to the $250 investment. Rather than wait for that scenario to materialize I added 4 velcro straps to hold the shield to the telescope. That works very nicely and makes it easy to take the shield off when it isn’t needed. Just wish that the Celestron engineers had thought of this before I did.

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

Very solidly built, and the front lid closes nicely, neatly hiding the cables for my Dew heater ring. One thing to keep in mind is the weight, so everything is balanced properly.

Great dew cover from celestron also keeps straylight from my telescope

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

Ottimo prodotto. Protegge il mio telescopio dall'umidità che abbiamo qui in Sicilia.