ATN ThOR 5 640 5-40x — 640×480 thermal riflescope

How far you can see a person

240 m make out detail391 m tell what it is1,563 m spot it┆ maker’s claim

501002005001k2k5k m

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

ATN quotes 3,200 m, 2× our figure, because makers usually measure against a person’s full height rather than their width. Why the numbers differ

ATNRiflescope · 640-class

ATN ThOR 5 640 5-40x

Approx. price: ~$3,695
Sensor: 640×480 · 12 µm
Lens: 75 mm · 5×
Weight: 44.1 oz

Buy from ATN

Price and availability on ATN’s site may differ.

Best for

A dedicated night rifle for hogs and coyotes on open ground

01Specifications

As published by ATN. Sources: atncorp.com (product page + compare API, sku TIWST5675A; ATN ThOR 5 manual; current price, list $4,095), lens: pyramydair.com spec table ('Objective lens: 75 mm', variant a=18984).

Sensor: 640×480
Pixel pitch: 12 µm
Refresh rate: 60 Hz
Lens: 75 mm
Base magnification: 5×
Digital zoom: up to 40×
Field of view: 5.9° horizontal
Display: 1024x768 OLED
Claimed detection: 3,200 m
Claim basis: human-sized target (ATN product page 3500 yd; ATN manual 'Human Detection Range' lists 3300)
Run time: 10 h
Battery type: Internal Li-ion
Weight: 44.1 oz
Length: 13″
Laser rangefinder: No
Ballistic calculator: Yes
Records video: Yes
Wi-Fi: Yes
Warranty: 5 years
Country of origin: USA
Approx. price: ~$3,695

02Pros and cons

From the published specs. What owners report is in the next section.

For it

640×480 sensor, 2.8× the detail of an entry-level 384
Smooth 60 Hz picture on a running animal
Ballistic calculator (you enter the range yourself)
10 h of battery, 33rd-longest of 344 here
Records video and connects to a phone app
Warranty: 5 years

Against it

Sensitivity (NETD) not published
Built-in battery, so no swapping in the field
Heavy at 44.1 oz, 16th-heaviest of the 194 riflescopes here
No rangefinder, so you judge distance by eye
Narrow 5.9° view, so a moving animal is hard to find
No waterproof rating published

03What owners say

owner discussions, 2024–2026

Summarised from 7 public owner discussions between 2024 and 2026. Owner experience, not a measurement; owners rarely distinguish the ThOR 5 640 variants, so this covers the family.

Owner discussion of the ThOR 5 640 does not separate the four magnification ranges, so this covers all of them. Most of what exists comes from one Central Texas hog hunter who runs it on a budget 300 Blackout AR at feeder distances of 40 to 115 yards and keeps posting results; he is happy with it, uses the rangefinder to range hogs, and bought it at an ATN store for 25 percent off with accessories, partly because the store promises to swap a faulty unit on the spot.

The reaction to his footage is the other half of the story. When he posted a night shot after a day of rain and high humidity, which he himself said made the thermal look bad, replies were blunt: several said they get better detail in fog or light rain from 256 and 384 units, and that a 640 should show far more. Shoppers asking about the 2-16x are mostly steered toward AGM, RIX, DNT or iRay instead, and one owner reports that the July 2025 firmware flattened black-hot contrast in summer heat and wants to roll it back.

What owners like

The rangefinder earns its keep for the one owner who posts regularly: he ranges hogs at feeder distance and out to about 115 yards before the shot.
Price is the draw; buying at an ATN store got one owner 25 percent off plus accessories, and the store offers an over-the-counter swap if the unit fails.
On clear, dark nights the owner's sow and boar footage at 40 to 50 yards shows the scope doing the job, and replies call it proof a budget build can still get it done.

Common complaints

Rain and humidity hit the image hard; the owner said the thermal looked terrible after a wet day, and people with Pulsar and other units say they see more in fog.
Several people who watched the footage say the picture does not look like a 640, with one claiming better image quality from 256-resolution units.
A firmware update in July 2025 left one owner with flat black-hot and white-hot contrast in summer heat despite manual NUCs and a factory reset, and he could not find the old version to roll back.
Reliability reputation is poor: a recurring reply is that ATN units die without warning, so the generous store warranty is something buyers say they would rather not need.
Shoppers asking about the 2-16x for 100 to 150 yard coyote work were told almost unanimously to look at AGM, RIX, DNT or iRay first, and an owner of the cheaper ThOR 5 320 regretted his purchase.

Does the ThOR 5 640 handle humid or rainy nights?

The owner who posts with it says no: after a day of rain the image looked terrible, and others with Pulsar units and lower-resolution scopes said they see more detail in fog. On clear dry nights his footage at 40 to 50 yards is serviceable.

Is the newest firmware worth installing?

One owner says the July 2025 update degraded black-hot and white-hot contrast in hot weather and wanted to go back to the earlier build. If your image is good, owners suggest keeping a copy of the firmware you are on before updating.