July 2026 - Written by the HeatSight Optics Team
HeatSight TPM C19-640 54mm Review - The C19-640 54mm stretches the C19 platform's legs: same 640×512 core, but behind a 54 mm objective at 2.5x base magnification, pushing human-sized detection past 5 km and identification to roughly 1,275 m. This is the open-country configuration - beanfields, pastures, and the long fence lines where a 35mm starts running out of pixels on target.
A compact tube-style thermal at 580 g with a 54 mm manual-focus germanium objective and 2.5x base magnification, expanding to 2.5-8x with electronic zoom. Dimensions are 198 × 57.5 × 64.3 mm. It mounts like a day optic and disappears on the rifle compared to the 3-pound LRF flagships from the big brands.
Every C19 shares the same 640×512 VOx core: 12 μm pixel pitch, ≤40 mK NETD, ≤50 Hz refresh, 8-14 μm band, manual focus, and a sharp 1440×1080 OLED display - a meaningful resolution step over the 1024×768 eyepieces common at this tier. Six palettes (White Hot, Black Hot, Fire Hot, Rainbow, Iron Red, Cold Color), picture-in-picture, hotspot tracking, and five menu languages are standard. Recording is onboard: 16 GB storage (13.8 GB usable), JPG/MP4, USB charge and export.
Power is a pair of removable 18350 cells (1,400 mAh each) rated for 5+ hours at ≤1.8 W. 18350s keep the scope compact, but they're less common at the corner store than 18650s - buy two spare pairs with the scope and rotate them. The housing is IP66 and rated to 1000G of recoil, operating -20°C to +60°C.
Where I can see a long way, this is the 640 I want. The 54mm lens puts more magnification on target natively, so animals at distance stay crisp instead of turning into zoomed-in pixels, and first detection on big-field heat comes remarkably far out. It wants a deliberate hunting style, positions and patience rather than covering ground. Feed it that and the image is the best argument in the C19 line.
Full 640×512 sensor at this price: Most competitors at this money are selling 384 cores.
1440×1080 OLED display: Sharper eyepiece image than the 1024×768 norm in this class.
Long-range detection: ~5,100 m detection / ~1,275 m identification on a human-sized signature - serious reach for the money.
Compact and light: 580 g on the rifle, standard mounting.
Pick the 54mm when your average shot is long and your scanning is done from a static position. Pair it with a handheld like the TPM-A30 monocular for wide-angle scanning and you have the classic two-device setup. 2-Year Limited Warranty, as with every HeatSight scope.
Specifications: 640×512 VOx, 12μm, NETD ≤40mK | 54mm, 8.1° × 6.5° | 2.5x base, 1-8x e-zoom | OLED 1440×1080, 0.39" | ≤50Hz | 6 palettes, PiP, hot tracking | 16GB, JPG/MP4, USB | 2×18350 1,400mAh, ≥5h | -20°C~+60°C | 1000G | IP66 | 198 × 57.5 × 64.3 mm | 580g
The HeatSight Optics TPM C19-640 54mm is available at heatsightoptics.com for $1,399 (regularly $1,699). It's in stock and ships from our Michigan facility. Questions about which HeatSight scope fits your hunting or property-security setup? Call us at (313) 338-8168 - you'll talk to the people who actually build and flash these units, not a call center.
This review was written by the HeatSight Optics team based on our own design, bench, and field testing of production units. We build these scopes, so consider the source - and consider that we also publish the cons, because we'd rather you buy the right scope than return the wrong one.