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This heat shield filter deflects convected heat due to an extremely heat stable polymer base and properties inherent in its resin. HSF is generally used to protect color filters in long range applications, especially when using dark colors such as blues and greens.
Position the heat shield filter between the lens and the color filter, allowing space on each side of the filter for the escape of heated air. Extenders which allow at least 1/2" of air space on each side of the filter will permit adequate venting and insure the longevity of the heat shield filter.