Used - Dew Heater Ring - 11"
Item #: U94053 / 94053-CGLPlease note: This is a gently used item. For complete product details, specs, and extras, please visit the original product page.
Gently Used, Fully Trusted
At Celestron, we believe the cosmos should be within everyone’s reach. That’s why our gently used items have been rigorously inspected and are in full working order—even if they show a few signs of past adventures. When you purchase this product, you’ll also enjoy the same comprehensive warranty as our new items, giving you confidence and peace of mind to explore the night sky.
Clear skies and happy stargazing!
Overview
Please note: This is a gently used item. For complete product details, specs, and extras, please visit the original product page.
Gently Used, Fully Trusted
At Celestron, we believe the cosmos should be within everyone’s reach. That’s why our gently used items have been rigorously inspected and are in full working order—even if they show a few signs of past adventures. When you purchase this product, you’ll also enjoy the same comprehensive warranty as our new items, giving you confidence and peace of mind to explore the night sky.
Clear skies and happy stargazing!
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Description
Specifications
| General | |
|---|---|
| Max Power: | 30 watts |
| Power Jack: | 12V DC barrel connector, 5.5mm/2.1mm, tip positive |
| Ring construction: | Aluminum |
| Power Jack extension cable: | 6" long, 12V DC, 5.5mm/2.1mm barrel connector on one end, male RCA connector on other end, tip positive |
| Thermistor Jack: | 2.5mm audio jack, compatible with Celestron SmartHeat Dew Controllers |
| Compatibility: | 11" Schmidt-Cassegrain, EdgeHD, Rowe-Ackermann Schmidt Astrograph (RASA) |
| Dew Heater Ring Inner Diameter: | 279.4mm (11") |
| Dew Heater Ring Outer Diameter: | 305.3mm (12.02") |
| Weight: | 4.69 oz (133.0 g) |
Accessories
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FAQ
The Dew Heater Ring is compatible with 5" or larger Celestron Schmidt-Cassegrain telescopes (SCTs) built since the year 2006. I’m not sure when my SCT was built. How can I determine if the Dew Heater Ring is compatible?
You can determine if the Dew Heater Ring is compatible with your Celestron SCT by examining the design of its rear cell. This applies to fork mounted optical tubes and optical tubes with dovetail mounting bars. Older generation Celestron SCTs (the C5, C8, C11, and C14) built before the year 2006 are not compatible with the Dew Heater Ring. These older optical tubes have either a flat face or a ribbed face on the rear cell. See photo examples below. 
Newer generation Celestron SCTs built in the year 2006 or later are compatible with the Dew Heater Ring. These newer OTAs have a trilobed shape on the rear cell. In addition, newer generation 14" SCTs have a rounded rear cell. See photo examples below. All EdgeHD, RASA, 6” Schmidt-Cassegrain and 9.25” Schmidt-Cassegrain telescopes are compatible with the Dew Heater Ring. 
During installation, I removed the telescope's Schmidt corrector retaining ring. But some of the gasket material underneath the ring is still stuck onto the front cell of the telescope. What should I do?
For the Dew Heater Ring to seat properly against the Schmidt corrector, all the gasket material should be removed. For most telescopes, the gasket material can be removed with little to no force. However, some units may have some gasket material stuck onto the front cell due to seepage from the glue used during assembly. If any gasket material is adhered firmly to the front cell, carefully peel or scrape it away. When you do this, make sure to use the included paper installation shield to keep particles off the Schmidt corrector lens. If you use a knife or other tool to remove the gasket material, be very careful to avoid coming into contact with the Schmidt corrector. Also, be sure the optical tube is pointing up when doing this (as shown in the manual during assembly) so the Schmidt corrector itself cannot easily shift its position in the cell.
When I am using the Dew Heater Ring in “stand-alone” mode by applying power directly to the ring (instead of using an optional Smart DewHeater Controller) that the heating element gets quite hot. Can this affect optical performance since the edge of the corrector will be warmer than the center?
For each of the Dew Heater Rings, we determined the amount of power required to heat the Schmidt corrector to keep it clear under very heavy dew conditions and engineered the circuitry accordingly. When used in “stand-alone” mode, the heater ring always operates at this maximum power, so the corrector will stay free from dew under virtually all environmental conditions. For smaller telescopes, this does not have a significant effect on optical performance, since not much heat is needed to keep the glass dew-free. However, on the 11” and 14” models, quite a bit of heat is required to keep dew from forming near the center of the Schmidt corrector around the secondary mirror under heavy dew conditions. Because of this, when operating at full power in stand-alone mode, there may be some slight degradation of optical performance for the 11” and 14” models under certain conditions. This is in no way different than other heating bands or straps. We highly recommend using one of the optional Celestron Smart DewHeater Controllers with these larger Dew Heater Rings, as the controller will only heat the corrector as dew conditions warrant, and no loss of optical performance will occur. We also recommend using an optional Celestron Aluminum Dew Shield with the 11” and 14” models, as the Dew Heater Rings (with optional controller) will then not need nearly as much power to heat the corrector to keep the optics clear.
Support & Downloads
| Manuals: |
|---|
| Dew Heater Ring Manual |
