A Lens Shade/Dew Cap is a tube, of approximately the same diameter as your telescope tube, designed to fit on the front end of the telescope to reduce the amount of dew that builds up on the corrector plate. It also serves as a Len Shade by preventing stray light from falling on the corrector plate, which greatly improves contrast.
Our four channel controller allows you to connect and control the output to four individual heat strips (not included). Most heater strips, tapes and pads from all the major manufacturers are supported
A high quality made dew shield by RVO with an integrated heating element to completely elimiate dew. With other brands, you also need a controller to control the temperature of the band. With ours, you get an integrated controller plus a small display box showing the temperature so you can easily set it up in the future.
The Astrozap dual channel controller uses pulse width modulation technology. Each channel controls two outputs for a total of four outputs. Each channel is capable of a duty cycle from 5% on time at the low setting to 95% on time at the high setting.