Information & Resources

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 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-alkali. Photonis tubes also ...

“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 ...