SV172 Dew Heater Review https://www.youtube.com/watch?v=OgbrK2rL_pw Author:Astro On Budget SVBONY SV172 Dew Heater Band For Telescopes, Eyepieces, Camera lens Dew Heater Strip. What causes dew on a telescope? When the surface of your telescope objective or camera lens drops below the ambient temperature of the air outside, moisture begins to condense. On a night with high levels of moisture in the air, dew forms even more aggressively. A telescope that has been “dewed-up” no longer captures clear images of your deep-sky target, and instead captures a washed-out featureless image that resembles a flat frame. To be a little more technical, the heat from the warmer telescope transfers to the colder outside temperature via radiation. When the telescope radiates its heat to the sky, it quickly cools down and drops below the dew point temperature. This chain of events causes condensation to form on your telescope or camera lens. Dew will ruin your imaging process Using dew heaters with your astrophotography rig can be the difference between capturing hours worth of exposure time on a target, and coming up empty-handed. Dew prevention is an essential precaution needed for long exposure imaging sessions and is something you will inevitably need to address at one point or another. Designed for astronomy telescopes, and compatible with DSLR camera lens,Spotting scope. Convenient USB port design Convenient USB port design; connect it to power source with USB port, such as 5Vpower bank, car charger, laptop, desktop computer, etc. 3 gear regulator with strong-medium-weak Heating Modes. 0.3meters 3 gear regulator with strong-medium-weak Heating Modes. You can adjust the temperature for different use requirements. Super-fast and continuous warming with fast start up to heat. 50mm narrow width does not interfere focusing 50mm narrow width does not interfere focusing, and will not produce dark corners in the field; it is also the width that reduces interference for other accessories on the lens barrel. Good keep warm effect Imitating OK cloth, SBR and Black-T three-layer keep warm material reducing heat dissipation, and the inner surface does not wrinkle after being bent. It fits the lens barrel better and which increases the keep warm effect. Nylon charging cable, low temperature resistance Even heating;Safe usage and short circuit prevent Even heating: the built-in aluminum film conduct even heating surface, no dead angle left. Safe usage and short circuit prevent. Alloy fiber heating wire provides super-fast and continuous warming. Silicone insulation process prevents internal short circuit. Package 2:240mm Fits outside diameters less than 76mm/3" Package 3:320mm Fits outside diameters less than 102mm/4" Package 1:400mm Fits outside diameters less than 127mm/5" Specifications

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