This is a review of the InfiRay FH35R Thermal Monocular.
These devices are typically used by hunters for scouting before and
after the shot, but there are many other uses like finding missing
persons. I really like this InfiRay. It has a good image quality, it’s
easy to use and it’s relatively small and light. On top of that, there’s
a Laser Range Finder (LRF) built-in, and while not
cheap, the device is reasonably priced. It’s been my companion on
several driven hunts, and I’ve used it to scout various areas to
discover the performance and possible limitations.
The FH35R thermal spotter features a 640x512 12 micron sensor, with
an integrated laser rangefinder, to deliver incredible performance
capturing fine details at precise distances with the capability to
detect out to 1800M man-sized targets.
The FH35R is equipped with 12µm 640×512 pixel
pitch high-resolution sensors featuring NETD =35mk and uses a 1024x768
resolution OLED display with a 3.4x to 13.6x mag range.
Coupled with the optimized image algorithm, it
creates stunning clear imaging now with replaceable battery pack modules
for quick change power in the field. (Two batteries included as
For a better visual
experience, Finder II supports switching between cold and warm image
hues. With the cold hue setting, users experience visually clearer
imaging quality with rich details and highlight targets. The warm hue
setting generates softer imaging to avoid visual fatigue brought by
Integrated Laser Rangefinder (LRF) up to 800m
The Finder II
Series has a built-in laser ranging module, which provides both single
ranging and continuous ranging,helping to capture target distance
accurately. With an accuracy of ± 1m within 800m, accurate evaluation of
distance and terrain is quick and easy.
Long Detection Range 1818 m
The 35mm objective
lens in combination with advanced thermal imaging hardware provides
exceptional detection. The FL35R & FH35R can boast detection ranges
of up to 1818 meters in complete darkness.
Replaceable Battery Pack
The battery can be
quickly removed and replaced with new ones in a matter of seconds. With a
replaceable Li-ion battery pack, you can enjoy up to 6 hours battery
life. Carrying an additional battery pack as standard can extend battery
life up to 12 hours.
Photo/video Recorder, Built-in 32GB Storage Capacity
The Finder II
Series is equipped with 32GB of digital storage video and photos. Saved
video and photo files can be transferred to a computer via wired
connection or to a phone via WiFi.
WiFi Connection & App Supported
The Finder II
Series and the InfiRay Outdoor app operate hand-in-hand, easily handling
frame sync and data output. The app offers additional features such as
access to the online InfiRay community and after sales support.
InfiRay Finder II Series Specifications
|Pixel pitch, µm
|Sensor NETD, mK
|Frame refresh rate, Hz
|Field of view (H x V), degrees
|Optical magnification, x
|Digital zoom, x
|Li-ion battery pack, replaceable
|Max. battery life (t=25?) ?, h
|Laser rangefinder range, m
|Built-in memory, GB
|Detection Range, m
(Target size:1.7m×0.5m, P(n)=99%)