Contrast ratio results for Nokia Lumia 620 High Brightness

Contrast ratio 618:1
Monitor model Nokia Lumia 620 High Brightness
Submitted 14 Aug 2014 04:07 CEST, by 178.143.*.*
Camera model Canon EOS 350D DIGITAL
Processing remarks

Warning: Image focal lengths/zoom levels are not the same.

Black
Screen photo
Luminance 0.68 cd/m2
Luminance spread 0.3 cd/m2 (2 standard deviations)
Exposure value –2.01 stops   (aim for –2 to –3)
Exposure spread 0.65 stops
Area used for calculation 0.811 x 0.912
Camera settings Exposure time: 2.5   ISO: 200   F-number: 4
Focal length: 58.4 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 421 cd/m2
Luminance spread 281 cd/m2 (2 standard deviations)
Exposure value –2.38 stops   (aim for –2 to –3)
Exposure spread 1 stops
Area used for calculation 0.974 x 1
Camera settings Exposure time: 1/320   ISO: 200   F-number: 4
Focal length: 70.1 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.