← All units
Calculated from the sensor's pixel pitch and the lens focal length, for clear air. 
How far you can see a person
135 m make out detail219 m tell what it is875 m spot it┆ maker’s claim
501002005001k2k5k m
Leica quotes 2,210 m, 2.5× our figure, because makers usually measure against a person’s full height rather than their width. Why the numbers differ
LeicaClip-on · 640-class · Laser rangefinder
Leica Calonox 2 Sight LRF
- Approx. price
- ~$5,899
- Sensor
- 640×480 · 12 µm
- Lens
- 42 mm · 1×
- Weight
- 23.1 oz
Buy from Leica
Price and availability on Leica’s site may differ.
Best for
Keeping your day scope and its zero while adding thermal at night
01Specifications
As published by Leica. Sources: leica-camera.com technical data PDF (May 2025), leicacamerausa.com (price; says made in Germany, while the Calonox 2 manual's CE block says Made in Portugal — origin left null).
- Sensor
- 640×480
- Pixel pitch
- 12 µm
- Refresh rate
- 60 Hz
- Lens
- 42 mm
- Field of view
- 10.3° horizontal
- Display
- 1920x1080 OLED
- Claimed detection
- 2,210 m
- Claim basis
- 1.7 m x 0.5 m subject, Leica 'acquisition' at 2 px (Leica 'detection' 770 m at 6 px)
- Run time
- 5 h
- Battery type
- Internal Li-ion
- Weight
- 23.1 oz
- Length
- 5.5″
- Records video
- Yes
- Wi-Fi
- Yes
- IP rating
- IP67
- Warranty
- 10 years (Passport Protection Plan)
- Approx. price
- ~$5,899
02Pros and cons
From the published specs, not owner reports.
For it
- 640×480 sensor, 2.8× the detail of an entry-level 384
- Smooth 60 Hz picture on a running animal
- Built-in laser rangefinder
- Waterproof (IP67), survives a dunking
- Records video and connects to a phone app
- Warranty: 10 years (Passport Protection Plan)
Against it
- Sensitivity (NETD) not published
- Built-in battery, so no swapping in the field, and only 5 h of it
- Heavy at 23.1 oz, 2nd-heaviest of the 29 clip-ons here
- 23.1 oz hanging off the front of your day scope
- Rangefinder but no ballistic calculator, so holdover is up to you
- ~$5,899, well above the ~$3,499 typical for clip-ons here
03Compare the LRF
04Related units
LeicaClip-on
Leica Calonox 2 Sight
Est. detection
875 m
Maker’s claim
2,210 m
- Sensor
- 640×480
- Pitch · Hz
- 12 µm · 60
- Lens
- 42 mm
60 Hz · 21.9 oz~$4,899
PardClip-on
Pard Predator 640 LRF
Est. detection
938 m
Maker’s claim
2,100 m
- Sensor
- 640×512
- Pitch · Hz
- 12 µm · 50
- Lens
- 45 mm
LRF · 15 oz~$3,499
SteinerClip-on
Steiner Nighthunter C35 Gen II
Est. detection
729 m
Maker’s claim
not published
- Sensor
- 640×512
- Pitch · Hz
- 12 µm · 50
- Lens
- 35 mm
16.2 oz~$3,450