InfiRay Eye III E3 Plus product image

InfiRay Eye III E3 Plus

The EYE III E3 PLUS is a thermal monocular made by InfiRay and is part of the Eye III series.


The Eye III E3 Plus spots a crisp 25mm objective lens collecting thermal radiation. The default field of view on this thermal monocular is 10.5 by 7.9 degrees. It has a 4 times digital zoom to enlarge (parts of) the image.

Behind the lens of the Eye III E3 Plus you can find the (uncooled, 12 micrometer) 384 x 288 pixels core refreshing the image at 50Hz. The thermal contrast (NETD) of this thermal monocular is <25mK.

The physical dimensions of this thermal monocular read 180 x 54 x 54mm (lwh) and the scale reads 480 grams. This device is rated IP67. It handles dust, shocks, water (splashes) and submersion under water. It's rated for operating in temperatures between -20°C and 50°C.

The Eye III E3 Plus can be used in scanning and surveillance, hunting adventures and police operations.



  • Ergonomic Design and Lightweight
  • Improved Image Processing Algorithm
  • Starts/shuts down by opening/closing lens-cap
  • Scrollwheel Menu Navigation
  • Magnetic Charger
  • Record Videos to Build-In Storage
  • Digital Compass
  • WiFi Streaming


Lens25 mm
Diopter adjustment-5 +5
Optical zoom3.5 x
Digital zoom4 x
FOV (h/v)10.5 ° / 7.9 °
Thermal typeUncooled
Sensor resolution (h/v)384 pixels / 288 pixels
Pixel pitch12 µm
Sensitivity25 mK
Display resolution (h/v)1440 pixels / 1080 pixels
Refresh rate50 Hz
Image polarityWhite hot, black hot, red hot, rainbow
Output screen colorFull color
Dimensions (l/w/h)180 mm / 54 mm / 54 mm
Weight480 g
TypeLi-ion 3.6V
Number of batteries1
Battery life8 hours
Law enforcement
Search & rescue
Fire fighting
Operating temperature-20 °C / 50 °C
Environmental ratingIP67

DRI Ranges

DRI stands for Detection, Recognition and Identification and is based on the widely used Johnson's criteria.

  • Detection Detect if an object is present
  • Recognition See what type of object it is (i.e. person, vehicle, airplane)
  • Identification For example see if someone is a friend or foe
Detection Recognition Identification
Rabbit 375 meters 93 meters 46 meters
Person 1319 meters 329 meters 164 meters
Vehicle 3194 meters 798 meters 399 meters

Please note that these values are calculated, always consult the manufacturer for official range numbers.


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