The effective observation distance of thermal imaging sights is influenced by various factors such as detector resolution, lens focal length, and thermal sensitivity. Different models of thermal imaging sights have significant differences in effective observation distance. Here are some examples of effective observation distances for common thermal imaging sights:

-Onick RM-35 thermal imaging sight from Onica: The detector resolution is 384 × 288, the lens focal length is 35mm, the detection distance for humans is greater than 1000 meters, and the recognition distance is greater than 250 meters; The detection distance for objects (2.3m × 2.3m) is greater than 1500 meters, and the recognition distance is greater than 400 meters.

-CE THERMAL ZS series thermal imaging tactical sight: Taking ZS-335 as an example, the detector resolution is 384 × 288, the lens focal length is 35mm, and the detection distance is 1350 meters. In this series, the model with a focal length of 25mm has a human detection distance of 2500 meters and a recognition distance of 625 meters; The model with a focal length of 50mm has a detection distance of 5000 meters and a recognition distance of 1250 meters for humans.

-Pulsar Semion 2nd Generation Thermal Imaging Sight: This series includes models such as XL60, XP60, and XG60, all of which use 60mm objective lenses. Among them, the detection distance of XL60 is 2800 meters, and the basic magnification is 2.5 times; The detection distance of XP60 is 2000 meters, and the basic magnification is 3 times; The detection distance of XG60 is 2800 meters, and the basic magnification is 4 times.

-Trijicon REAP-IR Thermal Imaging Sight: Equipped with a 640 × 480 resolution, 12 μ m pixel pitch non heating thermal imaging sensor, featuring a 60mm large lens design and a detection range of over 2400 meters.

-* * Yingrui Patrol Ship R1 Thermal Imaging Sight * *: Equipped with a 10mm focal length lens and an F0.89 aperture, it can detect humans at a distance of about 600 meters, pets such as cats and dogs at a distance of about 400 meters, and fist sized targets at a distance of about 60 meters.