***** **********Best Quality Guranteed. *****It prevents condensation by warming up the lens on a camera or telescope. *****Proven effectiveness against condensation; outside in a field; at a temperature of 5
F*****DN30: the length is 30cm, for
outside diameter: 10cm, lens UV size is less than 72mm*****Dew heater strap is an essential accessory that protects your optical tube from excess moisture forming condensation on the corrector lens*****Cloth covered with foam insulation on outer side for maximum efficiency and performance