LENS SYSTEM: Star-Tron's 300 mm focal length, T-1.9 catadioptric objective lens, is ideally suited for night-vision use. The optical design is a fast f/1.4 in a package with a total length of only 220 mm and a weight of less than 16 pounds. The design also boasts exceedingly low chromatic aberration, delivering crisp images over its full 480-910 nm (extended blue) operating range. It's ideal for 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 300 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 300 mm lens is normally equipped with either a tripod or a yoke and trunnion mounting system. The yoke and trunnion permits the lens to be tilted without shifting its center of gravity. An adjustable brake, separate positive lock, and an adjustable elevation scale are standard on the yoke pivot. This mount is designed for attachment to either a standard heavy duty tripod, or a low-profile militarized tripod. | 
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