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Image intensifier
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===4G=== In 2014, French image tube manufacturer PHOTONIS released the first global, open, performance specification; "4G". The specification had four main requirements that an image intensifier tube would have to meet. * Spectral sensitivity from below 400 nm to above 1000 nm * A minimum figure-of-merit of FOM1800 * High light resolution higher than 57 lp/mm * Halo size of less than 0.7mm
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