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Information & Resources

Modulation Transfer Function Explained (MTF)

Modulation Transfer Function Explained (MTF)

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...
Halo value summarized

Halo value summarized

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...
Tube Type Rundown

Tube Type Rundown

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...
Tube Options Summary

Tube Options Summary

  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 vs Dark Spot

Blem vs Dark Spot

“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 ...