If I recall effectively Augie from TNVC wrote relating to this in on the list of old threads and he claimed slender movie beats all else for the genuinely darkish things but all NV tubes have boundaries.My PVS14 is really an L3 slender film by using a photocathode sensitivity of 2500uA/lm, I have noticed lots of unfilmed tubes hover about 2000uA/lm