If you are researching the THOR 4 thermal scope, you are really asking whether the older generation still makes sense or whether the current ATN ThOR 6 is the smarter buy. The ThOR 4 was a strong scope in its day, but it has been replaced by two full generations of upgrades. This comparison puts the older ThOR 4 next to the current ThOR 6 so you can see exactly what a generation jump changes in sensor, image processing, and features — and decide which belongs on your rifle.
How the older THOR 4 works
The THOR 4 works as a self-contained thermal weapon sight from an earlier ATN generation, and for its time it did the core job well. It reads the heat difference between a target and its surroundings, displays it through the optic, and records video, with a 640x512 option at the top of the line. But its sensor is less sensitive than today's, its image processing is the older standard without AI enhancement, and its refresh rate lags what current scopes deliver. It still detects game, but the picture is coarser and slower than a modern hunter expects, and it is no longer the current line.
How the current ATN ThOR 6 works
The ATN ThOR 6 640x512 3-24x works on the same heat-reading principle but with a generation of refinement stacked on top. Its sensor is rated at 15 mK — NETD in millikelvin is the smallest temperature difference the sensor can resolve, and this lower number means a cleaner, higher-contrast image than the ThOR 4 could produce. SharpIR AI enhancement sharpens the picture in real time, the refresh rate is faster for smoother tracking of running animals, and detection reaches 3650 m. It also adds Zeroing Freeze, Hot Point Tracking, and ATN Connect 6, none of which the ThOR 4 generation offered.
When to choose the THOR 4
Choose the THOR 4 only if you already own one and it still meets your needs. There is no reason to seek out the older generation for a new purchase — it has been superseded, and every advantage it once held has been carried forward and improved in the ThOR 6. If your ThOR 4 is working and your hunting is close-range and undemanding, there is no urgency to replace it, and there is nothing wrong with running it until it no longer keeps up with the way you hunt. But as a fresh buy today, it is the outgoing product rather than the one to invest in, and the money is better put toward the current generation that will stay supported and up to date for longer.
When to choose the ATN ThOR 6
Choose the ATN ThOR 6 for any new purchase, and especially if you want the cleanest image, the longest reach, and the modern feature set. The 15 mK sensor and SharpIR processing give you a sharper, higher-contrast picture; the faster refresh keeps running hogs and coyotes crisp instead of smeared; and the longer detection range opens up bigger ground. If you are upgrading from a ThOR 4, this is the direct step forward — same top resolution, a full generation better everywhere else.
Our recommendation
For a new buy, the ATN ThOR 6 640x512 3-24x is the recommendation, with the ThOR 6 640x512 2-16x as a lighter-magnification alternative that shares the same sensor and features. The older THOR 4 belongs in the past unless you already own one and it still serves you. See the full current lineup and specs on the ATN thermal scope collection to compare the ThOR 6 variants and confirm which magnification fits your ranges.
How we compared them
We compared the older THOR 4 generation with the current ATN ThOR 6 on the criteria that actually change a hunt: sensor resolution, NETD sensitivity, detection range, refresh rate, image processing, weight, and battery. Because the ThOR 4 is a previous generation, this is a comparison of old versus current within ATN's own line — not an independent lab review. The honest trade-off is that the ThOR 4, if you already own one, still functions for close work; it is simply outclassed on image quality and features. For anyone buying new, the ThOR 6 is the right call. Check the specs against your ranges before deciding.
Frequently Asked Questions
Is the THOR 4 still worth buying?
For a new purchase, no. The THOR 4 is a previous generation that has been replaced by the ThOR 6, which improves sensitivity, image processing, refresh rate, and detection range. It is only worth keeping if you already own one and it still meets your needs.
What is the difference between the THOR 4 and the ThOR 6?
The ThOR 6 is a full generation newer. It adds a more sensitive 15 mK sensor, SharpIR AI image enhancement, a faster refresh rate, longer detection range, and features like Zeroing Freeze and Hot Point Tracking that the ThOR 4 generation lacked.
Do the THOR 4 and ThOR 6 use the same resolution?
Both offer a 640x512 sensor at the top of their lines, so peak pixel count is similar. The ThOR 6's advantage is a more sensitive sensor and better image processing, which produce a cleaner, higher-contrast picture at that resolution.
Should I upgrade my THOR 4 to a ThOR 6?
If you want a sharper image, smoother tracking of moving game, and longer reach, the ThOR 6 is a meaningful upgrade. If your ThOR 4 still works for close-range hunting, there is no urgency, but the ThOR 6 is the direct step forward when you do replace it.
Which ThOR 6 replaces the THOR 4 640?
The ThOR 6 640x512 3-24x is the closest current match, keeping the 640 resolution while upgrading everything around it. The ThOR 6 640x512 2-16x is a lighter-magnification alternative with the same sensor and feature set.
Is the ThOR 6 harder to use than the THOR 4?
No. The ThOR 6 keeps a familiar layout and adds conveniences like Zeroing Freeze and ATN Connect 6 that make setup and sharing easier. If you are comfortable with a ThOR 4, the ThOR 6 will feel like a smoother version of the same idea.
If your search started with the THOR 4, the honest answer is that the current ATN ThOR 6 does everything it did and more, for any new purchase. It keeps the 640 resolution you were after and adds a generation of sharper imaging, faster tracking, and longer reach on top. Compare the current variants, read the full specs, and check pricing on the ATN thermal scope collection. Match the magnification to your ranges, and you will step onto the current generation instead of buying into an outgoing one.
Created: August 10, 2026 · 10:05:21 UTC
