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InfiRay Finder FH25R

A wide-angle 640×512 Finder: 25 mm lens, 17.5° field of view, 600 m rangefinder, in a 320 g body. Discontinued but still traded.

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Manufacturer specification

TechnologyThermal
Sensor640×512
Pixel pitch12 µm
NETD≤40 mK
Lens25 mm
Magnification1.5–6x
Digital zoomup to 4x
Detection range1,298 m
Field of view17.5°
DisplayLCOS 1280x960
Recordingphoto and video
Wi-Fi / appyes
Battery lifeup to 6 h
Batterybuilt-in Li-ion
Weight320 g
Water resistanceIP66

Figures as published by InfiRay (source). A spec that is not listed is one the maker does not state, not a zero. Detection range is for a 1.8 m object under the maker's conditions; recognition is typically a third of it.

Type: Thermal monoculars Brand: InfiRay

The Finder FH25R pairs a 640×512, 12 µm detector with a short 25 mm lens, which gives an unusually wide 17.5° field of view for a 640 unit and a low 1.5x base magnification. Digital zoom steps from 1.5x to 6x. Stated detection range is 1,298 m, and the built-in laser rangefinder reads to 600 m.

The 40 mK sensitivity is modest by current standards. It records to 16 GB of internal memory, streams over Wi-Fi, runs about 6 hours on a built-in battery, and is rated IP66. Weight is about 320 g.

The wide view and 640 detail make it good for woodland, hedgerows and anywhere animals appear close and move fast; it is less suited to long-range spotting than the 35 mm Finders. InfiRay has discontinued it, so expect clearance pricing and compare against the current 640 Finders and HIKMICRO Falcons before buying.

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