Alpha Optics AO-4431/4461 Thermal Imaging Weapon Sight

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Alpha Optics AO-4431/4461 Thermal Imaging Weapon Sight

Key Features:

- High-aperture F/1.0 lens with fixed focus from 10 m to infinity

- Waterproof and nitrogen purged

- Light enclosure of aluminum alloy with rubber coating

- Stands against the recoil of large-caliber weapon

- Automatic silent calibration

- Black and white colour palettes

- User friendly menu

- Option of external power supply

- Video output

- Option of detachable laser rangefinder


PDF icon Download Spec Sheet (830.98 KB)
Thermal Image Core384 x 288, 17μm 640 x 480, 17μm
Spectral Rangefrom 7.5 to 14 μm from 7.5 to 14 μm
Frequency50 Hz25 Hz
Sensitivity< 50 mK < 50 mK
Lens System100 mm; F/1.0 100 mm; F/1.0
Field of view 3.7° × 2.8°6.2° × 4.7°
Optical Zoom7.1x4.2x
Digital Zoom2x, 4x2x, 4x, 8x
Lens Focus10m to infinity10m to infinity
Detection Range (human size)2000 m2400 m
Diopter Adjustment-5 to +5 dpt -5 to +5 dpt
DisplayAMOLED 800 x 600 AMOLED 800 x 600
Battery TypeTwo CR123A Two CR123A
Battery Life at 25°CUp to 5 hoursUp to 5 hours
Operating Temperature -30°C to +50°C -30°C to +50°C
Environmental RatingIP67 IP67
Maximum impact load500 g 500 g
Dimensions (L x W x H)290 × 116 × 116 mm 290 × 116 × 116 mm
Weight 1237 g 1237 g


The Alpha Optics AO-4431/4461 thermal imaging weapon sight is one of the most advanced scopes in its class. Displaying the thermal differences in the scene, the high-performance thermal imaging system of the device provides round-the-clock, all-weather detection and discrimination of heat-generating objects, including those that are hidden. The attachable distance measuring unit with the distance readout on the device display enables to estimate accurately the target distance. Rubber coated enclosure of the Alpha Optics AO-4431/4461 features conveniently located control elements. The device is designed with the shutter-less calibration technology enabling quick start and continuous image without stops and delays. The specially developed control electronics of the device works without complicated menu. Ballistic corrections and four memory slots enable saving zeroing profiles for different distances and different types of ammunition. Intuitive menu of the device enables to select the reticle type, its colour and brightness, as well as to adjust manually the image brightness and contrast, the core thermal sensitivity and other parameters. Attachable external power supply increases significantly the runtime of the sight. The AO-4431/4461 is effective at long ranges regardless of light and weather conditions, such as in total darkness or through smoke, haze, fog, and light rain.