MTF (Modulation Transfer Function) has been a topic of discussion lately. Here’s a breakdown of what it means in a basic sense.
MTF can be thought of as a measure of contrast at given intervals of spatial resolution. To understand this we need to understand what spatial resolution is. In Night...
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Halo value is a metric not often discussed. Halo in a simple sense refers to the amount of “halo” effect seen around a light source viewed through an image intensifier. A large halo will tend to white out or wash out the image in the area of the light source.Now that we know what halo is in a pra...
Before we dive into a quick synopsis of tube types it’s important to understand these are minimum qualifying characteristics or metrics. Tubes of all types regularly exceed their minimums. These serve as only a baseline representation point of reference.
PHOTONIS DEFENSE
Photonis Commercial:
A t...
EBI (Equivalent Background Illumination)
EBI is a metric of noise and can be thought of as that, equivalent background noise. A condensed version is - a measured low light base noise level minus no light base noise level. This gives you your end noise value, or EBI. 2.5 is the MIL-SPEC maximu...
Tube Options:
Photonis Echo:
These tubes are most closely related to Gen 2 by US definition due to the lack of GaAs (gallium arsenide - a semi conductor), though technically they’re a hybrid technology as they utilize a multi-alkali photocathode. Whereas Gen 2 of the "old days" used a bi-alka...
“Blem” and “Dark Spots.” What do they mean?Dark Spots:Dark spots are inherent to the manufacturing process. Could be a particle sandwiched in the intensifier, fiber optic, or various other circumstance. All tubes are allowed dark spots. This is why there is a prescribed dark spot allowance. Dark ...