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Contrast ratio of Nexus 5

Contrast ratio 945:1
Monitor model Nexus 5
Submitted 26 Sep 2014 21:34 CEST, by 91.157.*.*
Camera model Canon EOS 30D
Processing remarks

Note: image file 2: suggested exposure time: 1/410 s (Set EV to +0.3)

Black
Screen photo
[open image]
Luminance 0.26 cd/m2
Luminance spread 0.16 cd/m2 (2 standard deviations)
Exposure value –3.02 stops   (aim for –2 to –3)
Exposure spread 0.92 stops
Area used for calculation 0.369 x 0.416
Camera settings Exposure time: 1.6   ISO: 400   F-number: 4
Focal length: 26.6 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 250 cd/m2
Luminance spread 43 cd/m2 (2 standard deviations)
Exposure value –0.78 stops   (aim for –2 to –3)
Exposure spread 0.25 stops
Area used for calculation 0.369 x 0.416
Camera settings Exposure time: 1/125   ISO: 400   F-number: 4
Focal length: 26.6 mm   (35 mm equivalent)
Exposure compensation: 2

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.