Abstract
To assess the improvement in visual perception of low light level events obtainable with a given image-intensifier system, one must take into account not only the prevailing photometric conditions in the field of view but also the non-ideal optical and electron-optical characteristics of the separate elements of the image-intensifier system, and the eye. In this paper the effects of these factors on the overall perception characteristics of direct-view systems are examined, with particular reference to the limitations associated with objective lens parameters, photon-noise, contrast-transfer, image-tube photosensitivity, limiting resolution, luminance-gain and integration-time.
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