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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Orion Optics UK Dew Heater for Sec. 20″

Orion Optics UK Dew Heater for Sec. 20″

by Orion Optics UK
SKU OOUK-SECONDARY-DEW-HEATER-ODK20TR-CARBON
$1,537.14 - $1,537.14
$1,537.14
$1,637.14
$1,637.14 - $1,637.14
$1,637.14
Price Match Policy!
  • Custom-designed for the Orion Optics UK 20-inch ODK secondary mirror
  • Prevents dew formation to maintain maximum image contrast
  • Lightweight carbon fibre construction
  • Ensures peak performance from your hand-figured optics
  • Integrates with standard 12V dew heater controllers
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Dew Heater for Sec. 20″

    This Orion Optics UK Dew Heater is engineered specifically to protect the secondary mirror of your 20-inch ODK Truss telescope from moisture. By applying gentle, controlled heat, this essential accessory ensures your 20-inch aperture operates at its full potential, preventing the contrast-robbing effects of dew. Preserve the flawless images produced by your hand-figured optics on even the most humid nights with this custom-fit heater for the 20-inch ODK.

    Protect Your 20-inch ODK's Secondary from Dew

    The secondary mirror is the most exposed optical surface in a Newtonian or Cassegrain design, making it the first component to collect dew. Even a thin film of moisture will scatter light, dramatically reducing image contrast and obscuring fine planetary or deep-sky detail. This heater is custom-built for the ODK20's secondary housing, ensuring efficient heat transfer without compromising collimation or obstructing the light path.

    Carbon Fibre Construction: Lightweight and Efficient

    Constructed from carbon fibre, this secondary heater adds minimal mass to the telescope's spider assembly. This is critical for maintaining the mechanical stability and balance of the 20-inch ODK, preventing any flexure that could degrade optical alignment. The material's excellent thermal properties ensure even heat distribution, gently warming the mirror just above the dew point without introducing tube currents.

  • Why do I need a specific dew heater for the Orion Optics UK 20" ODK secondary?

    A generic dew strap is not suitable for a secondary mirror assembly. The Orion Optics UK Dew Heater for Sec. 20" is custom-shaped to fit the specific dimensions of the ODK20's secondary housing. This ensures a secure fit, efficient heating, and avoids any interference with the telescope's light path or collimation screws.

    How does this dew heater improve images from my 20-inch ODK?

    By preventing dew from forming on the secondary mirror, this heater preserves the high contrast and sharpness your ODK20's hand-figured optics are designed to deliver. A dew-free secondary ensures that faint details on planets like Jupiter and subtle structures in distant nebulae are not washed out by scattered light, allowing you to get the most out of every clear night.

    Is the ODK20 Dew Heater compatible with standard dew controllers?

    Yes, this dew heater is designed to be powered by common 12V DC dew heater control systems. You will need a compatible controller with an available output channel to regulate the power delivered to the heater. Always verify the connector type matches your specific control box.

    What are the signs that my ODK20 secondary mirror has dewed over?

    The first sign of dew on the secondary is a significant loss of image contrast. Stars will appear less sharp, and faint objects will become difficult or impossible to see. In severe cases, the entire field of view will look grey and washed out, as if you are looking through a fog. This heater prevents that from ever happening.

    How is this carbon fibre heater different from a standard dew strap?

    A standard dew strap is a flexible fabric band with a heating element, designed to wrap around an eyepiece or refractor dew shield. This heater is a rigid, custom-molded carbon fibre component designed for permanent installation on the back of the secondary mirror housing. Its lightweight, rigid construction is essential for maintaining the precise balance and collimation of the secondary mirror assembly.

    Can I leave the Dew Heater for Sec. 20" permanently installed?

    Yes, this heater is designed for permanent installation on your ODK20 telescope. Its minimal weight and custom fit mean it will not interfere with the telescope's operation, balance, or storage. You can simply connect it to your dew controller at the start of each session.

  • Orion Optics UK 1-Year Warranty