ATN ThOR 4 640 Thermal Scope Review

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The Thor HD Range is the best range of thermal scope from ATN. The ATN Thor 4 Series is the latest version of the thermal scope with the HD Range.

The ATN Thor 4 640 2.5-25x thermal scope is one of the best products in the Thor 4 Series.

The ATN designs this Thor series thermal scope with all the important features for your best hunting experience.

The magnification ranges differ in every version of this thermal scope. This ATN Thor 4 640 2.5-25x thermal scope has an excellent magnification range that helps to detect the target from long-distance.

This model thermal scope is the best choice for your needs under your budget.

ATN ThOR 4 640 2.5-25x Thermal Scope Review

Arctic Silver 5 Thermal Paste


  • Sensor: Gen 4 640 x 480
  • Magnification: 2.5 – 25X, 1 – 10X
  • Sensitivity: <50 mK
  • Spectral Range: 7-14 µm
  • Field of View: 12.5 x 9.7° & 32 x 25°
  • Eye Relief: 90mm
  • Display: 1280 x 720
  • Refreshing Rate: 60 Hz

Thermal Resolution

This ATN Thor 4 640 2.5-25x Thermal Scope is equipped with the Ultra-sensitive Gen 4 Sensor; due to this, you can get the crisp and clear image of the target.

The Thermal resolution of this sensor is 640×480 pixels; it ensures that the images are displayed in high-quality.

The superior quality thermal sensor has not compromised the image that you are zooming in the target.

It also shows clear images in the dark and low light conditions. The refreshing rate of this sensor is 60 Hz, in which it will refresh 60 times per second. Due to this refreshing rate, you can easily shoot the moving targets also. 

Obsidian Core

The ATN Obsidian IV Dual Core T processor has an integral and high speculated system; it will help to the smooth running of the sensor.

Due to this core processor, this thermal scope suppresses the large files and is saved in small memory space. The integrated sensor with the core processor allows you to work well in the night and low light conditions.


This thermal scope has the HD lens for the clear view of the object. The digital zooming range of this scope is 6x. The zoom wheel is placed on the left side of this scope; due to this, you can easily adjust the magnification range of this thermal scope.

The ATN Thor 4 640 thermal riflescope comes with the four different magnification ranges at 640 x 480 thermal resolution according to your needs. In this review, we’ve provided the two ranges 2.5-25x and 1-10x. Some of the features can be changed based on the magnification range that you chose.

Magnification is the main reason for the accuracy of your target while viewing. It provides a wide range of field of you so you can see the surrounding of your target area clearly. It contains a 60 Hz refresh rate in all the four different magnification ranges.

In 2.5-25x magnification

  • 1950 yards of identification range
  • 800 of human recognition range

In 1-10x magnification

  • 830 yards of identification range
  • 350 yards of human recognition range

SensorGen 4 640×480Gen 4 640×480Gen 4 640×480Gen 4 640×480
Refresh Rate60 Hz60 Hz60 Hz60 Hz
FOV32 x 25°24 x 19°12.5 x 9.7°8.3 x 6.2°
Eye Relief90mm90mm90mm90mm
Battery16 hours16 hours16 hours16 hours


The 1280×720 HD microdisplay is equipped in this thermal scope; it shows the high-quality view of the target.

Due to this HD Display, you can clearly view the captured images and videos. The spectral responsive range of this thermal scope is 7-14 µm; hence the display shows a detailed view of your surroundings. 


The dimension of the objective lens of this thermal scope is 50mm; it clearly shows the long-distance target.

The eye relief distance of this scope is 90 mm; it will protect your eye and eyebrows from the injuries in the tactical situations.

The field of view of this scope is 12.5 x 9.7°; it ensures that you can clearly view the wide range of your surroundings. 

Image and Video

This ATN Thor 4 640 Thermal Scope is equipped with an in-built recorder; due to this, you can record your hunting experience in image and video format.

The videos are saved in the MOV format, and you can save the captured images in JPEG format. A 64 GB memory card is equipped with this thermal scope; you can save the images and videos in this SD card. 

Recoil Activated Video

Usually, Rifle Scope is designed for making your hunting easier. Most of the hunters would like to catch their shots on video for reviewing their hunting movements, but the hunters may have missed capturing the movement due to the resilience of triggering.

By using this RAV mode of this thermal scope, you can capture the picture and record your hunting movement. When you set the scope in RAV mode, every movement of the scope is saver automatically.

Smart Rangefinder

An integrated rangefinder is equipped with this Thor 4 640 2.5-25x Thermal Scope, which helps the hunter to hit the target perfectly.

Using this smart rangefinder, you never get worried about the complex calculation and guessing the target; it will help you to get the perfect range of the target. The reticles of this rangefinder are automatically changed and pointing to the target. 

Easy to Use Navigation System

The Navigation System of this scope is more helpful for the novice hunters. The navigation menu for the different functions of this scope is pretty straight forward so that you can easily choose your required function.

The intuitive menu layout and the minimal button of this scope ensure that you need to toggle the features on or off. 

Power and connectivity

The 18650 Lithium-ion battery is used as the power source of this scope; due to this battery, you can continuously use this thermal scope for 16 hours.

Using the charging kit, you can recharge this battery. This Thor4 640 2.5-25x Thermal scope has the Bluetooth and Wi-Fi feature so that you can connect your scope with other devices.

Due to this feature, you can transfer the stored data to other devices. Using the Obsidian app, you can control your thermal scope with the Wi-Fi connectivity. 

Temperature and Detection Range

The temperature range of this ATN Thor4 640 2.5-25x Thermal Scope is -28°C to 48°C; you can easily detect the object in this temperature range.

The human detection range of this scope is 1950 yards, and the recognition range is 800 yards. By using this thermal scope, you can easily identify the 475 yards; this detection range ensures that it is a perfect scope for tactical use.

Arctic Silver 5 Thermal Paste
Magnification: 2.5-25X

Final Words

This ATN Thor4 640 2.5-25x Thermal Scope affords you another view of the target. Due to the thermal imaging night vision technology of this scope, you can easily view the target into the dark.

This Thor Series riflescopes come at an affordable price, which is the perfect choice for the novice hunters. You can use this thermal scope for several fields and applications to shoot the target.

About Annalena Wood

Annalena is carrying her rifle with passion and pride for her love of the outdoors and the experience of hunting. Her most memorable hunting season was back in 2015 when she and her dad were drawn for special elk tags. That allowed them the chance to fill their tags with an actual bull elk rather than a spike. That year both her and her dad came home with their first trophy elks, with hers a 6 by 6 pointer and her dad’s a 6 by 5.