What is the difference between NVT-4, NVT-5, NVT-6 and NVT-7?
NVT-x denotes the grade of image intensifier tube that is installed in the device. NVT-4 is our entry level intensifier, and NVT-7 is our highest grade intensifier.
| NVT-4 | NVT-5 | NVT-6 | NVT-7 | |
| Autogating or ABC (Automatic Brightness Controll)? | ABC (Optional autogating) | ABC (Optional autogating) | Autogating | Autogating |
| MTTF (Mean Time To Failure in hours) | 10,000 | 10,000 | 10,000 | 10,000 |
| Illumination gain, EU Units (Min) | 8,000 | 9,500 | 10,000 | 10,000 |
| Illumination gain, US Units (Min) | 25,120 | 29,830 |
31,400 |
31,400 |
| FOM - Figure of Merit (Min) | 1,311 | 1,600 | 1,800 | 2,000 |
| Resolution in lp/mm (Min) | 57 | 64 | 64 | 68 |
| Signal to noise ratio (Min) | 23 | 25 | 28 | 30 |