July 2026 - Written by the HeatSight Optics Team
HeatSight TPM C19-640 75mm Review - The C19-640 75mm is the maximum-reach configuration of the platform: a 640×512 core behind a 75 mm objective at 3.5x base magnification, with human-sized detection out toward 7 km and identification approaching 1,800 m. This is a specialist's scope - open range, long beanfields, property overwatch - where nothing else in the lineup can follow.
A compact tube-style thermal with a 75 mm manual-focus germanium objective and 3.5x base magnification, expanding to 3.5-8x 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.
The 75mm is a specialist and I use it like one. Over big open ground it finds and holds detail on heat at distances the smaller lenses only hint at, and the narrow field of view stops mattering when everything you care about is far away. This is a tripod-and-position scope, glass the country, pick apart what you find, move with a purpose. Inside 100 yards it is the wrong tool; past 300 it is the only one I want.
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.
The longest reach we sell: ~7,000 m detection and ~1,770 m identification on a human signature.
Compact and light: on the rifle, standard mounting.
Buy the 75mm for the specific job of seeing further than anything else at the price. For general predator work, the 54mm is more versatile; the 75mm is for when the country is big and the shots are honest. 2-Year Limited Warranty, as with every HeatSight scope.
Specifications: 640×512 VOx, 12μm, NETD ≤40mK | 75mm | 3.5x 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
The HeatSight Optics TPM C19-640 75mm is available at heatsightoptics.com for $1,899 (regularly $1,999). Check the product page for current stock - this model sells through quickly; contact us to get on the list for the next batch. 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.