In short: A tube’s “generation” describes the technology it is built on, not how good the image is. In practice, tubes are compared today by their datasheet specs, mainly FOM. Civilians in the EU typically buy devices with European Photonis/Exosens tubes or Chinese NNVT tubes; US Gen 3 devices are subject to ITAR and are not commonly available to civilians in the EU. Tubes and devices using them fall under the EU export control regime for dual-use items.
How a tube works (and why generations are built on it)
Every modern image intensifier tube works in three stages: the photocathode turns light into electrons, the microchannel plate (MCP) multiplies them, and the phosphor screen turns them back into a visible image. A power supply unit (PSU) controls the process. Historically, generations differed mainly in the type of photocathode and whether there was an MCP.
Generations in brief
| Label | What is typical | Note |
|---|---|---|
| Gen 0 | early tubes that could not significantly amplify ambient light without an infrared illuminator | historical, no practical relevance today |
| Gen 1 | multialkali photocathode (S-20), no MCP; “cascade” tubes made the first truly passive night vision possible | the first passive devices historically |
| Gen 2 | microchannel plate (MCP) added; multialkali photocathode (S-25) | according to Photonis, the breakthrough of the 1970s; the three-stage principle still applies today |
| Gen 2+ / “Super Gen” | improved multialkali photocathode and MCP | not a formally recognised category in the US generation classification |
| Gen 3 | gallium arsenide (GaAs) photocathode; ion barrier film on the MCP | US technology, subject to ITAR |
| “Gen 4” / filmless | tubes without the ion barrier film, with autogating | the US NVESD revoked the “fourth generation” designation in 2002; officially there is no Gen 4 |
Be wary of labels like “Gen 4”, “Gen 3+” or “Gen 2+ HD” in listings. They are not standards but marketing names anyone can use. On their own, they tell you nothing about what you’ll see at night.
Why we talk about FOM instead of generations
According to Photonis, the US Government concluded back in 2001 that generation was not a determining factor in a tube’s performance, and the generation label was also dropped from the US ITAR export rules. The key criterion became FOM (Figure of Merit).
According to Photonis, FOM is resolution multiplied by signal-to-noise ratio (FOM = resolution × SNR). A higher FOM generally means a better image in low light. That’s why manufacturers now specify tubes mainly by FOM and other parameters – Photonis, for example, lists a minimum FOM of 1800 for its 4G tube.
Photonis also points out that its tubes use a different photocathode from US Gen 3 (a hybrid multialkali, “HyMa”, instead of GaAs) and have no ion barrier film (filmless). So it makes little sense to slot them into a “generation” – compare the specs instead. We explain how in How to read a tube datasheet.
What civilians in the EU can buy
- European Photonis / Exosens tubes. The manufacturer labels them “MADE IN EU” and “ITAR FREE” in its leaflets and states that, as a European company, it is not bound by ITAR. Its ECHO range is explicitly aimed at sport shooters, hunters, airsofters and night vision enthusiasts, and is available with green or white phosphor.
- Chinese NNVT tubes (North Night Vision Technology). You’ll commonly find them in complete devices on the EU civilian market. The same rule applies: what counts is the datasheet of the specific tube.
- US Gen 3 devices (GaAs tubes) are subject to US ITAR rules, so they are not commonly available to civilians in the EU. If you see one in a listing, verify its origin and paperwork.
So rather than looking for the “highest generation”, look for a tube whose specs match your use, with a serial number and an original datasheet.
EU export controls: Regulation 2021/821
In the EU, image intensifier tubes are classed as dual-use items (with both civilian and military uses). This is governed by Regulation (EU) 2021/821, whose Annex I lists the controlled items. Exporting Annex I items outside the EU requires an authorisation.
- 6A002.a.2 – image intensifier tubes and specially designed components. For tubes with a peak response between 400 and 1,050 nm, this covers tubes with an MCP (or a fine-pitch electron sensing device) and specified photocathode types – e.g. multialkali (S-20, S-25) with a luminous sensitivity above 350 μA/lm, or GaAs/GaInAs.
- 6A003.b.3 – imaging cameras incorporating tubes specified in 6A002.a.2.a or 6A002.a.2.b.
The Commission updates Annex I regularly. The version currently in force is Delegated Regulation (EU) 2025/2003, which replaced Annex I and has applied since 15 Nov 2025. In September 2026 the Commission adopted a further update (C(2026)6323); as of 9 Nov 2026 we could not confirm its publication in the Official Journal or its entry into force, nor whether it affects Category 6.
What this means for buyers: export controls mainly concern exports outside the EU. The rules on owning and using night vision (e.g. for hunting) are set nationally – see Night vision laws in Europe. If you buy second-hand or from outside the EU, keep proof of purchase and know the device’s origin (see also Buying used night vision).
Summary
- A generation describes technology (photocathode, MCP, film), not image quality.
- Officially there is no “Gen 4”; treat such labels in listings with caution.
- What counts today is FOM (resolution × SNR) and the other datasheet specs.
- Civilians in the EU typically buy devices with Photonis/Exosens or NNVT tubes; US Gen 3 is subject to ITAR.
- Tubes and devices using them are dual-use items in the EU (Regulation 2021/821, Annex I, 6A002 / 6A003).
The information on this page is general, is not legal advice, and laws change. We cite the source and the date we checked it. Before buying or using a device, verify the rules with the relevant authority or hunting association. Last checked: 9 Nov 2026.
Sources
- Regulation (EU) 2021/821 of the European Parliament and of the Council setting up a Union regime for the control of exports, brokering, technical assistance, transit and transfer of dual-use items – EUR-Lex (checked 9 Nov 2026)
- Commission Delegated Regulation (EU) 2025/2003 of 8 September 2025 replacing Annex I to Regulation (EU) 2021/821 (OJ L, 14 Nov 2025, in force from 15 Nov 2025); entries 6A002.a.2 and 6A003.b.3 – EUR-Lex (checked 9 Nov 2026)
- Report on the Commission Delegated Regulation of 14 Sep 2026 (C(2026)6323) intended to update Annex I – Baker McKenzie Sanctions & Export Controls Update (checked 9 Nov 2026)
- Exosens (Photonis): Difference between Gen3 and 4G – PDF (checked 9 Nov 2026)
- Exosens: 4G leaflet (“MADE IN EU”, “ITAR FREE”) – PDF; ECHO & ECHO14 leaflet – PDF; Night Vision one pager – PDF (checked 9 Nov 2026)
- Wikipedia: Image intensifier (history of generations, Super Gen, filmless, revocation of the Gen IV designation) – en.wikipedia.org (checked 9 Nov 2026)