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Thousand Oaks 1"x 4" Heater Band (0.25 amps) for 1.25" Eyepieces, used with 4-Channel DDHC Digital Heater Control Unit


Dew heater bands are used to prevent condensation on optical surfaces in
cooler weather. The most common source of moisture is dew, however; moisture
from your own eye can also condense on an eyepiece in extremely cold weather.
When is comes to dew, the best defense is a good offense. Simply maintaining
the temperature of your optical surfaces above the dew point will prevent
condesation from happening. The most problematic optical surfaces, listed in
order of their susceptibility are as follows: Corrector Plates on Schmidt-
Cassegrain Telescopes Meniscus lenses on Maksutov Cassegrain Telescopes
Objective lenses on Refractors Eyepiece eye lenses in very cold weather
Thousand Oaks Optical offers dew heater bands from 4 to 50 inches in length.
These heater bands are wrapped around the outside of the area to be heated,
such as around the metal cell of a corrector plate or objective lens. They
attach themselves using a built in Velcro elastic strip. In the case of an
eyepiece, the band wraps around the eyepiece itself. Very little heat is
actually required, and too much heat can have negative effects as well. These
heater bands feature standard RCA jacks to receive a 12 VDC power supply. Use
of an adjustable dew heater controller is highly recommended.


  • Use with 1.25" eyepieces
  • Requires Dew Heater Controller DDHC or similar
  • Consumes 0.25 amps @ 12 Volts DC

Product Details

  • Package Dimensions: 6.8 x 2.7 x 1.6 inches
  • Item Weight: 2.08 ounces
  • Shipping Weight: 1.92 ounces

Shipping & Handling

Orders are shipped within one day and tracking information is provided as soon as it is available from our carriers

Please ensure the correct shipping address is provided at the time of purchase. We cannot correct your address after purchase. We will not be responsible for incorrect addresses or undeliverable addresses.

Shipping to AK, HI, PO boxes, or APO addresses is not provided.

Return Policy

Returns within 14 days are excepted and a 15% restocking fee will be charged.

Filed under: Eyepieces & Accessories