What it is best for

The TM50-640 is for long-range night work where image quality at a distance is everything: glassing big open country, herd protection, and confirming game well beyond. The 50 mm lens and 640 sensor give the most detailed far-distance image in the handheld Sidewinder line.

Key features and specifications

• 640×512 12-micron sensor with industry-leading sub-20 mK NETD
• 50 mm Germanium lens, F1.0 aperture, for maximum reach (~45 ft at 100 yd FOV)
• 2.5x base magnification, 2.5-20x digital zoom
• Sharp 1024×768 OLED display, 50 Hz refresh
• 64 GB built-in memory, video and audio recording
• Removable 18650 rechargeable battery; spares supported
• Wi-Fi and AGM Connect app, USB-C power, IP67, rubber-armoured body, 5-year warranty

Trade-offs and who it is not for

The large lens narrows the field of view, so this is a long-range specialist rather than a fast, close scanner. It is also the most expensive Sidewinder monocular, but the TM35-640 offers a wider view and similar image quality for a lower price.

Pairs well with

• If you want a wider view: AGM Sidewinder TM35-640 Thermal Monocular
• If you want a rangefinder built in: AGM Fuzion LRF TM50-640 Thermal Monocular
• If you compare the range: Thermal Monoculars

FAQ

• Is the TM50-640 the longest-range Sidewinder? Yes, among the handheld Sidewinder monoculars, the 50 mm lens and 640 sensor give the most far-distance detail.
• Do I lose field of view with the 50 mm lens? Yes, the view is narrower than the 35 mm model, which is the trade for extra reach and magnification.
• Does it take a replaceable battery? Yes, it uses removable 18650 cells and can also run on USB-C external power.

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