Contrast ratio of Apple iPad 2

Contrast ratio 853:1
Monitor model Apple iPad 2
Submitted 10 Apr 2011 23:29 CEST, by 98.234.*.*
Camera model Canon PowerShot S95
Processing remarks


Black
Screen photo
Luminance 0.18 cd/m2
Luminance spread 0.03 cd/m2 (2 standard deviations)
Exposure value –1.87 stops   (aim for –2 to –3)
Exposure spread 0.24 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 1.3   ISO: 400   F-number: 2
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 154 cd/m2
Luminance spread 36 cd/m2 (2 standard deviations)
Exposure value –1.48 stops   (aim for –2 to –3)
Exposure spread 0.34 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 1/501   ISO: 400   F-number: 2
Focal length: 28 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.