Guide's long-range 640×512 monocular: 50 mm F1.0 lens, 20 mK, 1920×1080 AMOLED display, 1,000 m rangefinder and two swappable 18650 cells.
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Guide TJ650 LRF vs Liemke Keiler 25.1
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.
Liemke's compact 384×288 thermal with a 25 mm F1.0 lens, 10.5° field of view, 32 GB memory, IP67 body and a removable pack rated at 10 hours.
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Specification side by side
| Guide TJ650 LRF | Liemke Keiler 25.1 | |
|---|---|---|
| Technology | Thermal | Thermal |
| Sensor | 640×512 | 384×288 |
| Pixel pitch | 12 µm | 12 µm |
| NETD | ≤20 mK | ≤40 mK |
| Lens | 50 mm | 25 mm |
| Magnification | 3.8–30.3x | 2.4–24x |
| Digital zoom | up to 8x | up to 10x |
| Detection range | 2,000 m | 1,250 m |
| Field of view | 8.8° | 10.5° |
| Display | AMOLED 1920x1080 | OLED 1024x768 |
| Recording | photo and video | photo and video |
| Wi-Fi / app | yes | yes |
| Battery life | up to 10 h | up to 10 h |
| Battery | 2x removable 18650 Li-ion | removable Liemke BP-K Li-ion pack |
| Weight | 625 g | 445 g |
| Water resistance | IP67 | IP67 |
Sources: Guide TJ650 LRF (spec page); Liemke Keiler 25.1 (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: Guide TJ650 LRF · Liemke Keiler 25.1 · 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