Electrooptic Legat 355 product image

Electrooptic Legat 355

The LEGAT 355 is a thermal weapon sight made by Electrooptic and is part of the Legat 3 series.


The Legat 355 features a crisp 55mm f/1 objective lens focusing the available thermal radiation. The field of view on this thermal scope is 7.6 by 5 degrees. It features a 4 times digital zoom to enlarge your subject. The eye relief distance is measured at 52mm.

Behind the lens of the Legat 355 you can find the (uncooled, 12 micrometer) 384 x 288 pixels thermal core refreshing the image at 50Hz. The thermal contrast (NETD) of this thermal scope is <45mK and it's operating within the 7µm to 14µm infrared spectrum.

The physical dimensions of this thermal scope read 178 x 64 x 52mm (lwh) weighing in at 560 grams. This device is rated IPX6. It handles dust, shocks and water (splashes). It's rated for operating in temperatures between -25°C and 50°C.

The Legat 355 is built to be used in hunting adventures and police operations.



  • Centered reticle during zooming
  • Scalable reticles
  • Six zeroing profiles
  • Picture-in-picture (PiP)
  • up to 4X (smooth) digital zoom
  • Completely digital signal with noise filtering


Lens55 mm
Diopter adjustment-4 +3
Eye relief distance52 mm
Optical zoom5.5 x
Digital zoom4 x
FOV (h/v)7.6 ° / 5.0 °
Focus range10m to infinity
Thermal typeUncooled
Sensor resolution (h/v)384 pixels / 288 pixels
Pixel pitch12 µm
Sensitivity45 mK
Spectral range7 µm / 14 µm
Display resolution (h/v)1024 pixels / 768 pixels
Refresh rate50 Hz
Image polarityFive color palettes
Output screen colorFull color
Package contents18650 battery, User manual, Carrying bag
Dimensions (l/w/h)178 mm / 64 mm / 52 mm
Weight560 g
Number of batteries1
Battery life6 hours
Operating temperature-25 °C / 50 °C
Environmental ratingIPX6
Law enforcement
Search & rescue
Fire fighting

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 825 meters 206 meters 103 meters
Person 2902 meters 725 meters 362 meters
Vehicle 7027 meters 1756 meters 878 meters

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


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