LENS SYSTEM: Optical Systems Technology's Star-Tron® 170 mm focal length, T-1.9 catadioptric objective lens, is intended for passive night-vision use. The optical design is a fast f/1.4 in a package with a total length of only 140 mm and a weight of less than 2.8 pounds. The design exhibits low chromatic aberration, and provides crisp imagery over its full 450-910 nm (extended blue) operating range. It is compatible with both 2nd and 3rd generation intensifiers. New multilayer antireflection coatings yield better than 99.4% average transmission through each lens element, and are extremely resistant to scratches and stains. Stray light testing has led to the development of a high-performance internal baffling system for the 170 mm lens. This system uses a combination of diffusing surfaces, antireflection threads, and oven-cured antireflective paint to suppress glare from bright lights within and outside of the field of view. Vacuum and immersion testing were used to refine the sealing and produce a dry-nitrogen-purged lens, environmentally sealed and designed and tested to withstand water immersion to a depth of 3 feet. Ports are included for the user to purge the lens as well. MOUNTING SYSTEM: The 170 mm lens is either hand-held, tripod-mounted, or used with a custom low-profile tripod. | 
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