Contrast ratio results for Nec MultiSync LCD2490wuxi2

Contrast ratio 740808:1
Monitor model Nec MultiSync LCD2490wuxi2
Submitted 02 Jul 2015 18:20 CEST, by 31.31.*.*
Camera model unknown
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 1190.3 s (Set EV to +17.7)
Warning: image file 2: automatic white balance can cause inaccuracies.

Black
Screen photo
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –20.21 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.395 x 0.475
Camera settings Exposure time: 1/180   ISO: 160   F-number: 2.2
Focal length: 29 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 285 cd/m2
Luminance spread 21 cd/m2 (2 standard deviations)
Exposure value –0.71 stops   (aim for –2 to –3)
Exposure spread 0.11 stops
Area used for calculation 0.396 x 0.472
Camera settings Exposure time: 1/180   ISO: 160   F-number: 2.2
Focal length: 29 mm   (35 mm equivalent)
Exposure compensation: 0

The luminance values in cd/m2 are not very reliable, since camera sensitivities can easily differ up to 50% from their nominal value. Typically, the real luminance is 30% lower than this number. The area used for calculation is chosen such that it corresponds to a viewing angle of ±14° horizontally and ±10.5° vertically, which is equivalent to viewing the screen from a distance of about 1.5 times the diagonal size.

Unfortunately, there is a lot of variation in how cameras use EXIF settings. If photos from your camera your produce unusable results, try coming back in a few days. I review submitted pictures regularly and try to fix problems.