Celestron Aluminium Dew Shields with Cover Cap
Celestron Aluminium Dew Shields with Cover CapCelestron Aluminium Dew Shields with Cover CapCelestron Aluminium Dew Shields with Cover Cap

Celestron Aluminium Dew Shields with Cover Cap

  (5 Reviews)
✓ 2 year warranty


5x in stock shipped 1-2 working days

About this product

Model:  celestron_94021
Part Number:  94021

The Celestron Aluminium Dew Shield with Cover Cap is an essential accessory that protects your telescope tube in the field. The dew shield reduces radiative cooling of the Schmidt corrector lens to the night sky, thus keeping the lens below the dew point longer preventing dew formation on the lens. Additionally, the Aluminium Dew Shield increases image contrast by blocking stray light from entering the telescope for better viewing and astroimaging. Use the Aluminium Dew Shield on your telescope tube confidently, knowing it was created for your exact instrument. 


The Aluminium Dew Shield provides a perfect, custom fit for Celestron telescope tubes.  The exterior of the dew shield is a rigid, aluminium cylinder that will not fold, flex, or deform. Inside, a velvet-lined interior absorbs any additional stray light and excess moisture, creating optimal contrast when viewing and imaging. Attach the dew shield to your telescope tube with the two adjustable clips to ensure a snug fit.

We’ve also constructed the cover cap from durable yet lightweight aluminium. When your telescope is not in use, place the cover cap on your dew shield to protect your Schmidt corrector from stray dust particles. The cover cap also offers you the ability to quickly and easily acquire dark frames for imaging.

If you’re an astroimager who enjoys using your Schmidt-Cassegrain or EdgeHD in the Fastar/Hyperstar configuration or the RASA, you’re probably used to running cables out the front of the dew shield. Simplify and streamline your setup with the Aluminium Dew Shield’s integrated cable management slot at the base. This slot gives you an easy way to corral essential cables (like the ones for our Dew Heater rings) without potentially allowing light pollution to leak in. Also, there are cutouts to accommodate dovetail rails on the top and bottom of the telescope tube, ensuring a good fit regardless of the configuration.

Enhance your setup

When purchasing this item, you will receive 2x adhesive Celestron logo labels. Use them on your dew shield or anywhere else you like!

Check out the Dew Heater ring and the Smart DewHeater and Power Controllers to optimise your setup for the ideal dew-free night of observing and imaging.


  • Helps prevent dew formation on the Schmidt corrector lens
  • Prevents off-axis glare from entering the optical system
  • Rigid body with a velvet-lined interior surface to reduce stray light
  • Two adjustable clips for easy installation and disassembly
  • Cable management at the base of the shield —perfect for using the Fastar/Hyperstar configuration or using in conjunction with the Celestron Dew Heater Rings
  • An included cover cap keeps your telescope free from dust when not in use

Customer reviews

Average Rating (5 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Built for the telescope
Monday, 15 August 2022  | 

This dew shield fits my RASA 8 well. Clamps down snuggly. Very little light leakage. A bit fiddly at first to get all the cables to fit.

Rating (max 5):  
Great Experience UK to Australia in 6 days
Tuesday, 5 July 2022  | 

I was super happy with my purchase of my 2 Celestron Aluminium Dew Shields with Caps for my RASA 8 and EdgeHD 8 along with the 2 Dew Heater Rings within 6 days from Exeter UK to Caves Beach NSW Australia. This was after my frustration with my local Aussie supplier who has promised stock over the last few month but can never deliver. Well done First Light Optics

Rating (max 5):  
An excellent investment even though expensive
Monday, 20 June 2022  | 

I was hesitant to purchase this new dew shield from the Celestron range knowing that I'd need the C14 version which is at the top of the expense ladder for these shields.

This was really a last ditch attempt to deal with issues around light pollution from some LED street lights ringing my garden as well as general house light pollution in the neighbourhood.

The shield is very large, but light in weight, and is nearly the length of the C14 OTA. It is extremely well made, has excellent cable management and clamps the OTA really tight- it is not going to fall off even when the telescope is less than horizontal. The inside finish is a lush dark velvet and it has a tightly fitting aluminium cap. The rigidity is top notch with a superb finish and some spare decals which can be used wherever you want. The smaller aluminium Celestron flashes did peel off- the glue was either badly applied or they were bent in slightly the wrong shape- I may need to use my own cement on these- however that's a very minor point.

Being so deep that it produces excellent flats with no light leakage. It is best to use a really dim panel and take advantage of the protracted length with a panel balanced on top of the shield to minimise any effects caused by to bright a panel which can cause the light to bounce around and produce flats that perform badly. No such issues with this shield as the length keeps the panel far away from the corrector plate and any errant relections if you go dim. By using ND 1.2 films on my ELP panel I'm able to get away with 7 second L subs which produces great calibration.

I'm inpressed with the tightness of the fiting and the break out of cables through the cable management routing system.

I wish however is was not so expensive- it does the job really well however the cost may put off a lot of potential buyers especially if you plan the full dew management setup offered by Celestron which would run to nearly a 1000.00 if you went for the 4 port dew controller and corrector plate heater ring. It would of course be a bit cheaper for the smaller OTA offerings however the 4 port dew controller is really expensive for the features offered.

Rating (max 5):  
C11 Edge HD with new Celestron Aluminum dew shield
Monday, 6 June 2022  | 

FLO delivered quickly as usual. Installing is straightforward but be ready to rebalance your scope as the shield weights 4.8kg. I recommend you use a dovetail sliding counterweight as it may need to come off for collimation, corrector cleaning, taking flats or hyperstar maintenance (unless you have very long arms and are very tall!).

Rating (max 5):  
Excellent Service/Price
Tuesday, 24 May 2022  | 

As usual excellent from FLO which is why I continue to buy from them despite Brexit complications. The shield is well made and so much more stable than the flexible shield I have been using. Plus it will make flats easier as I have a RASA and balancing a light pad on the flexible shield was not ideal. Note there is enough give in the aluminium to allow the use of the BuckeyeStargazer Cable Router.


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