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



How far you can see a person
112 m make out detail182 m tell what it is729 m spot it
501002005001k2k5k m
SteinerClip-on · 640-class
Steiner Nighthunter C35 Gen II
- Approx. price
- ~$3,450
- Sensor
- 640×512 · 12 µm
- Lens
- 35 mm · 1×
- Weight
- 16.2 oz
Buy from Steiner
Price and availability on Steiner’s site may differ.
Best for
Keeping your day scope and its zero while adding thermal at night
01Specifications
As published by Steiner. Sources: steiner-optics.com page (item 9525, MSRP $3,449.99) + Steiner C35 Gen II user guide (V FOV 10.03 deg; single 18650).
- Sensor
- 640×512
- Pixel pitch
- 12 µm
- NETD
- <30 mK
- Refresh rate
- 50 Hz
- Lens
- 35 mm
- Field of view
- 12.5° horizontal
- Display
- 1280x960 OLED
- Run time
- 9 h
- Battery type
- 18650
- Weight
- 16.2 oz
- Length
- 4.7″
- Records video
- Yes
- Wi-Fi
- Yes
- IP rating
- splash-proof
- Warranty
- 2 years
- Approx. price
- ~$3,450
02Pros and cons
From the published specs, not owner reports.
For it
- 640×512 sensor, 3× the detail of an entry-level 384
- Takes 18650 batteries you can swap in the field
- 9 h of battery, 81st-longest of 344 here
- Light at 16.2 oz, 6th-lightest of the 29 clip-ons here
- Records video and connects to a phone app
Against it
- 16.2 oz hanging off the front of your day scope
- No rangefinder, so you judge distance by eye
03Compare the II
04Related units

ArmasightClip-on
Armasight Operator 640 1-4x35
Est. detection
729 m
Maker’s claim
1,305 m
- Sensor
- 640×480
- Pitch · Hz
- 12 µm · 60
- Lens
- 35 mm
60 Hz · 16.7 oz~$3,439

AthlonClip-on
Athlon Cronus ATS Pro 35C-640
Est. detection
729 m
Maker’s claim
not published
- Sensor
- 640×512
- Pitch · Hz
- 12 µm · —
- Lens
- 35 mm
17.2 oz~$3,500

AthlonClip-on
Athlon Cronus ATS Pro 35CL-640
Est. detection
729 m
Maker’s claim
not published
- Sensor
- 640×512
- Pitch · Hz
- 12 µm · —
- Lens
- 35 mm
LRF · 17 oz~$4,000