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Contrast ratio of Ipod Touch 4G

Contrast ratio 365:1
Monitor model Ipod Touch 4G
Submitted 13 Dec 2010 06:48 CET, by 69.253.*.*
Camera model Canon PowerShot SD800 IS
Processing remarks


Black
Screen photo
[open image]
Luminance 0.16 cd/m2
Luminance spread 0.05 cd/m2 (2 standard deviations)
Exposure value –3.36 stops   (aim for –2 to –3)
Exposure spread 0.44 stops
Area used for calculation 0.393 x 0.393
Camera settings Exposure time: 1   ISO: 408   F-number: 2.8
Focal length: 27.2 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 58 cd/m2
Luminance spread 11 cd/m2 (2 standard deviations)
Exposure value –1.51 stops   (aim for –2 to –3)
Exposure spread 0.27 stops
Area used for calculation 0.393 x 0.393
Camera settings Exposure time: 1/101   ISO: 408   F-number: 2.8
Focal length: 27.2 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.