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Field of view (FOV) is the maximum area of a sample that a camera can image, FOV is related to the focal length of the lens and the sensor or detector size. Since the size of detector is fixed, FOV is actually decided by focal length of the lenses. Double FOV lenses has a designed mechanism to switch one focal length to another focal length.
Hangzhou Shalom EO offers the LWIR dual FOV LWIR lenses with magnificent from X2 to X4, a series of designed lenses has been listed for your choice and custom free-designed lenses are available upon your request.