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| Orion Dew Zapper for 8" Schmidt-Cassegrain | 
 enlarge | Brand: Orion
Category: Photography
Buy New: $39.95
Avg. Customer Rating:  2 reviews
Media: Electronics
MPN: 03503
UPC: 410000061558
EAN: 0410000061558
ASIN: B0000XMUB4
Availability: Usually ships in 1-2 business days
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| Features:
| • | Electronic dew elimination system keeps dew from forming on the corrector lens | | • | Runs on 12-volt DC power | | • | Plugs into a car cigarette light or a field battery (sold separately) | | • | Fits all Meade and Celestron 8" Schmidt-Cassegrains |
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| Editorial Reviews:
Product Description
With Dew Zapper, you'll never have to stop observing to remove condensation from the front plate of your Schmidt-Cassegrain or Maksutov-Cassegrain. An unprotected corrector lens will radiate heat, quickly cooling to below ambient air temperature, allowing dew to form. Dew Zapper gently replaces lost heat, bringing the temperature of the corrector lens back above the dew point. Dew can't form, and you never get "heat wave" disturbances like those caused by warm-air blowers and heated dew caps. The flexible, fiberglass-reinforced heating element straps securely in place with a Velcro fastener. Runs on 12-volt DC power. Plugs into a car cigarette-lighter receptacle or a "field battery," delivering up to 20 watts, 2 amps. All models include a 10' cable.
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| Customer Reviews:
 Does What It Says December 31, 2007
I've used this device three times, most recently for two hours on a cold and humid night. I have not had a trace of condensation on my telescope's optics. My OTA was wet, and my red dot finder was cloudy, but views through my OTA were pristine.
 Observe longer with the Dew Zapper September 8, 2004
2 out of 2 found this review helpful
If you observe the night sky using a telescope in a humid environment, then you have probably had an observing session cut short by dew forming on your lens. The Dew Zapper delays/prevents the onset of dew/frost (depending upon conditions) to prolong your observing sessions. The one drawback of this model is that you cannot adjust the heat output of the device, since too much heating can cause tube currents (of air) that tend to affect your viewing. Using a dew heater along with a dew shield (lens shade) will prolong your observing sessions in humid environments.
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