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The 2x Optical Extender Lens from FLIR doubles the focal length of the 19mm lens and transmits a 12-degree angle of view when used with the HS-324 (or HS-324 Pro) thermal monocular. This accessory lens features a manual focus ring and quickly connects/disconnects via the quick-change bayonet mount on the monocular housing.
Note: This lens is not waterproof and should not be used in wet conditions.