Fixed-Pattern Noise (FPN)
A faint hexagonal (honeycomb) pattern throughout the image area that most often occurs under highlights conditions. This pattern is inherent in the structure of the Microchannel plate and can be seen in virtually all Gen 2 and Gen 3 systems…
Figure of Merit (FOM)
Image Intensification tube specification designation, calculated on line pair per mm x signal to noise.
Eye Relief
The distance a person’s eyes must be from the last element of an eyepiece in order to achieve the optimal image area.
