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Burris BTC35 v3 — 400×300 thermal clip-on
How far you can see a person
112 m make out detail182 m tell what it is729 m spot it┆ maker’s claim
501002005001k2k5k m
Calculated from the sensor's pixel pitch and the lens focal length, for clear air.

Burris quotes 1,000 m, 1.4× our figure, because makers usually measure against a person’s full height rather than their width. Why the numbers differ

BurrisClip-on · 400-class

Burris BTC35 v3

Approx. price
~$3,000
Sensor
400×300 · 12 µm
Lens
35 mm · 1×
Weight
16.2 oz
Buy from Burris

Price and availability on Burris’s site may differ.

Best for

Keeping your day scope and its zero while adding thermal at night

01Specifications

As published by Burris. Sources: burrisoptics.com page + BTC v3 manual (SKU 300623; clip-on unity 1x per page '1-4x'; 2x 16340 RCR123 rechargeable; video, photo via BurrisConnect app).

Sensor
400×300
Pixel pitch
12 µm
NETD
≤35 mK
Refresh rate
50 Hz
Lens
35 mm
Base magnification
1×
Digital zoom
up to 4×
Field of view
7.8° horizontal
Display
1024x768 OLED
Claimed detection
1,000 m
Claim basis
deer
Run time
2 h
Battery type
CR123
Weight
16.2 oz
Length
5.9″
Laser rangefinder
No
Ballistic calculator
No
Records video
Yes
Wi-Fi
Yes
IP rating
IP67
Warranty
3 years
Approx. price
~$3,000

02Pros and cons

From the published specs, not owner reports.

For it
  • Takes CR123 batteries you can swap in the field
  • Light at 16.2 oz, 6th-lightest of the 29 clip-ons here
  • Waterproof (IP67), survives a dunking
  • Records video and connects to a phone app
Against it
  • Only 2 h of battery
  • 16.2 oz hanging off the front of your day scope
  • No rangefinder, so you judge distance by eye
  • Zoom past 1× is digital and gets blurry

03Compare the v3

04Related units

More from Burris →All 400-class →All 35 mm →
Burris BTC35 v2 — 400×300 thermal clip-on
BurrisClip-on

Burris BTC35 v2

Est. detection
729 m
Maker’s claim
1,000 m
Sensor
400×300
Pitch · Hz
12 µm · 50
Lens
35 mm
16.2 oz~$3,000
Athlon Cronus ATS Pro 35C-400 — 400×300 thermal clip-on
AthlonClip-on

Athlon Cronus ATS Pro 35C-400

Est. detection
729 m
Maker’s claim
not published
Sensor
400×300
Pitch · Hz
12 µm · —
Lens
35 mm
16.7 oz~$3,000
Athlon Cronus ATS Pro 35CL-400 — 400×300 thermal clip-on
AthlonClip-on

Athlon Cronus ATS Pro 35CL-400

Est. detection
729 m
Maker’s claim
not published
Sensor
400×300
Pitch · Hz
12 µm · —
Lens
35 mm
LRF · 16.5 oz~$3,500
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