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SVBONY Dew Heater Strip DN40cm 5V for Telescopes and Camera DSLR Lens Linear Temperature Control Devices Keep Them from Fog Dew Freezing

Description

Size:40cm 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 condensation from happening. The most problematic
optical surfaces, listed in order of their susceptibility are as follows:1)
Corrector Plates on Schmidt-Cassegrain Telescopes, 2) Meniscus lenses on
Maksutov Cassegrain Telescopes, 3) Objective lenses on Refractors, 4) Eyepiece
eye lenses in very cold weather. Thousand 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. Specification: Cloth covered with foam insulation on outer side for
maximum efficiency and performance Electrical interface: USB Power Bank is
required for 2A Voltage: 5V maximum power:

Filed under: Eyepieces & Accessories