Setting method of minimum illuminance

How to set the parameters: Generally, reputable companies will measure the sensitivity under the following standards.

F stop

F 1.2

Color temperature 5600K

Video level 30 IRE

The reflectivity is 80%

Therefore, sincere camera manufacturers will mark the minimum illumination of 3 lux (F 1.4 5600K 30 IRE 80%) as follows. If any parameter is omitted, the result may be different by a factor of 10 to 1000.

For example, the same camera can be marked with no1lux (f1.45600k30IRE 80%) 0.001lux (f0.755600k1IRE1%). Some irresponsible manufacturers will label the ultra-high sensitivity camera1lux (f1.4 5600k30ire 80%) as follows, but it is labeled as 0.000 1 lux. Now you should know why! ! ! Because they are marked under the following conditions (F0.755600k10IRO.1%), do you want to know what this (F0.755600k10IRO.1%) means? F 0.75 is a kind of lens that will cost you $30,000 or more, and is generally not used in the closed-circuit monitoring industry. 10 IRE video is below the noise level, so nothing can be seen. The reflectivity of 0. 1% can only be obtained by placing a thin white line in a completely dark background.