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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. |
(Click for a larger image)
(Click for a larger image) |
