Contrast ratio results for Nexus7 2013

Contrast ratio 1131:1
Monitor model Nexus7 2013
Submitted 01 Aug 2013 06:04 CEST, by 67.81.*.*
Camera model Olympus XZ-2
Processing remarks

Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.

Black
Screen photo
Luminance 0.35 cd/m2
Luminance spread 0.1 cd/m2 (2 standard deviations)
Exposure value –3.26 stops   (aim for –2 to –3)
Exposure spread 0.41 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 0.5   ISO: 400   F-number: 2.8
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 396 cd/m2
Luminance spread 96 cd/m2 (2 standard deviations)
Exposure value –2.08 stops   (aim for –2 to –3)
Exposure spread 0.35 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 1/1000   ISO: 400   F-number: 2.8
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
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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.