Fujinon 16×40 S1640D Stabiscope Binoculars

Description

Stabilizing high-magnification views from vibrating aircraft and patrol boats, the Fujinon 16×40 S1640D Stabiscope Binoculars yields a 178.5-foot field of view at 1000 yards (3.4-degree actual). The 2.5mm exit pupil and 12mm eye relief demand tight eye alignment. A 167.3-foot close focus distance restricts this 3.92-pound instrument strictly to extreme distance surveillance.

Fully multi-coated optics feed BaK-4 roof prisms gimbaled inside a high-speed gyro-stabilized core canceling up to five degrees of motion. The armored housing measures 8.3 by 3.5 by 7.9 inches and weighs 3.92 lbs (1.78 kg). Nitrogen purged against moisture, it features individual ocular helical focusing, fold-down rubber eyecups, a plus or minus 5 diopter range, and power options using four AA batteries, a 2CR5 lithium pack, or direct DC input.

Key Features of Fujinon 16×40 S1640D Stabiscope Binoculars

Engineered for coast guard interdiction, aerial search and rescue, and offshore tactical tracking from heavy machinery. The internal high-speed gyro motor neutralizes severe engine vibration and wave roll, locking distant horizon targets in place.

• High-magnification 16x power paired with 40mm objective lenses
• Internal gyro-stabilization system canceling plus or minus 5 degrees of movement
• Phase-corrected BaK-4 roof prisms with fully multi-coated optical elements
• 178.5 ft field of view at 1000 yd (3.4-degree actual angle)
• 12mm eye relief with soft fold-down rubber eyecups
• Individual eyepiece focus system eliminating bridge flex and focal slippage
• Nitrogen gas purged housing sealed against heavy marine spray
• Dual power system accepting AA batteries, 2CR5 lithium cells, or external DC power

Gyro-Stabilization Mechanics & Aperture Physics

The mechanical gyro motor spins up to lock the internal prism gimbal, eliminating high-frequency motor shudder and low-frequency boat swell. The small 2.5mm exit pupil produces dark images past twilight, requiring daylight or illuminated targets for reliable subject identification.

Chassis Handling & Marine Electrical Power

At nearly four pounds, this optic requires two hands on the sculpted side hand-straps to maintain control. The individual helical eyepiece focusers lock each ocular independently to your vision, while the external DC input allows continuous bridge-mounted operation from shipboard electrical grids.

• High-speed gyro stabilization neutralizes wave heave and helicopter rotor rumble
• Independent eyepiece focusing ensures critical focal lock through rough vehicle handling
• Sealed battery compartment accepts standard commercial batteries or direct vehicle power

Fujinon Manufacturer Warranty & Case

Fujinon covers this specialized stabilization platform with their standard one-year limited warranty against manufacturing defects and electrical component failures. The complete factory package contains the Fujinon 16×40 S1640D Stabiscope Binoculars, heavy-duty pelican-style transport case, hand strap, neck strap, DC power cable, and an operation manual.