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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. |
(Click image for a larger view) |
