Effect of increase in equivalent background illumination (EBI) with temperature of second generation (18 mm) proximity focused image intensifier tube on the range performance of a passive night sight has been studied using the image intensifier minimum resolvable contrast model. It has been shown that for ambient temperatures of 40 o C and above, the range performance of sight goes down drastically under low-illumination level due to increase in the EBI. Deterioration in range performance is negligible when ambient illumination is relatively high as in case of clear-starlit condition.
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