Sig Sauer ECHO RV50-LRF — 640×512 thermal riflescope

How far you can see a person

160 m make out detail260 m tell what it is1,042 m spot it

501002005001k2k5k m

Calculated from the sensor's pixel pitch and the lens focal length, for clear air.

Sig SauerRiflescope · 640-class · Laser rangefinder

Sig Sauer ECHO RV50-LRF

Approx. price: ~$4,000
Sensor: 640×512 · 12 µm
Lens: 50 mm · 2.5×
Weight: 34.9 oz

We may earn a commission. Price and availability on Amazon’s site may differ.

Best for

Night shooting where ranging matters — hogs and coyotes past 150 yards

01Specifications

As published by Sig Sauer. Sources: sigsauer.com ECHO-R operator's manual PDF (spec table SKU SOEC32310: 2.5-20x, FOV 8.8 deg, 640x512 12 um 50 Hz, <=20 mK, OLED 1024x768, 12 h internal + 18500, 'IPX67', 15.0 in, 380 mm, 34.9 oz, 990 g with battery; 1000 yd LRF + Applied Ballistics Ultralight), scheels.com ($3,999.99, in stock).

Sensor: 640×512
Pixel pitch: 12 µm
NETD: ≤20 mK
Refresh rate: 50 Hz
Lens: 50 mm
Base magnification: 2.5×
Digital zoom: up to 20×
Field of view: 8.8° horizontal
Display: 1024x768 OLED
Run time: 12 h
Battery type: Internal + removable
Weight: 34.9 oz
Length: 15″
Laser rangefinder: Yes
Ballistic calculator: Yes
Records video: Yes
Wi-Fi: Yes
IP rating: IP67
Warranty: Infinite Guarantee
Approx. price: ~$4,000

02Pros and cons

From the published specs, not owner reports.

For it

640×512 sensor, 3× the detail of an entry-level 384
Sensitive sensor that picks out small heat differences on humid or rainy nights (104th-best of 285 that publish it)
Built-in laser rangefinder that feeds the ballistic calculator
Swappable battery pack, so a spare doubles the run time
12 h of battery, 8th-longest of 344 here
Waterproof (IP67), survives a dunking
Records video and connects to a phone app

Against it