What makes the Dew-Not DN013 different from cheaper resistance wire heaters?
The key difference is the thick-film heating element. Cheaper heaters use a thin wire that can create hot spots and burn out over time. The Dew-Not heater uses a flat, wide element where 66% of the surface radiates heat, providing more even and reliable dew prevention without risk of damaging your equipment or distorting your view.
What kind of controller do I need for the Dew-Not 12" heater?
You will need a 12V DC dew heater controller with an RCA-style output port. The Dew-Not DN013 is designed to be compatible with industry-standard controllers from major brands. The controller allows you to adjust the power output based on ambient temperature and humidity.
Will the 43" Dew-Not DN013 fit my 12" f/8 Dobsonian OTA?
Yes, absolutely. The 43.0" length is designed to wrap around the approximately 42-inch circumference of a standard 12" optical tube, with enough overlap for the Velcro to secure it firmly. It's an ideal choice for keeping the primary mirror or upper cage optics of a large Dobsonian free from dew.
How much power does the Dew-Not 12" heater draw from my field battery?
At 100% power, the Dew-Not DN013 draws 1.68 Amps. When connected to a dew controller, the actual draw will be lower as the controller cycles the power. A typical deep-cycle battery (e.g., 35Ah) can run this strip for many hours, even alongside other equipment.
Is the Dew-Not DN013 suitable for my 12" SCT's corrector plate while imaging the Andromeda Galaxy (M31)?
Yes, this is a primary use case for this heater. A 12" SCT corrector is highly susceptible to dewing up. The 43.0" strip fits perfectly around the front cell of most 12" SCTs, and its 20.2 W output is more than sufficient to keep the corrector plate clear through a long imaging session, ensuring your exposures of M31 remain sharp and high-contrast.
Is the heating element really 42" long if the strip is 43"?
Yes, that is correct. The active heating element inside the strip is 42" long. The overall strip length is 43.0" to accommodate the cloth and Velcro construction at the ends, ensuring a secure and fully insulated fit around the telescope.
