Burris's 400×300 handheld thermal with a 35 mm F1.0 lens, 1280×960 display, Wi-Fi app control and a tripod thread; a US product sold in small numbers in the UK.
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Burris BTH 35 v2 vs InfiRay Finder FH25R
Two thermal monoculars compared on the makers' own figures. Rows in bold are where they differ; a dash means that maker does not publish the figure.
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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Specification side by side
| Burris BTH 35 v2 | InfiRay Finder FH25R | |
|---|---|---|
| Technology | Thermal | Thermal |
| Sensor | 400×300 | 640×512 |
| Pixel pitch | 12 µm | 12 µm |
| Lens | 35 mm | 25 mm |
| Digital zoom | up to 4x | up to 4x |
| Field of view | 7.8° | 17.5° |
| Display | LCOS 1280x960 | LCOS 1280x960 |
| Wi-Fi / app | yes | yes |
| Battery life | up to 5 h | up to 6 h |
| Weight | 624 g | 320 g |
| NETD | — | ≤40 mK |
| Magnification | — | 1.5–6x |
| Detection range | — | 1,298 m |
| Recording | — | photo and video |
| Battery | — | built-in Li-ion |
| Water resistance | — | IP66 |
Sources: Burris BTH 35 v2 (spec page); InfiRay Finder FH25R (spec page). Detection ranges are for a 1.8 m object under each maker's own test conditions and are not directly comparable between brands.
Full pages: Burris BTH 35 v2 · InfiRay Finder FH25R · all thermal monoculars in stock today
Specifications are the manufacturers' published figures. Prices are Amazon.co.uk at our last daily check. As an Amazon Associate we earn from qualifying purchases. More