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Contrast ratio of Apple 2009 MBP 15"

Contrast ratio 740:1 (edge: 958:1)
Monitor model Apple 2009 MBP 15"
Submitted 28 Nov 2009 04:29 CET, by 208.157.*.*
Camera model Canon PowerShot G9
Processing remarks


Black
Screen photo
[open image]
Luminance 0.46 cd/m2
Luminance spread 0.18 cd/m2 (2 standard deviations)
Exposure value –2.19 stops   (aim for –2 to –3)
Exposure spread 0.58 stops
Area used for calculation 0.488 x 0.488
Camera settings Exposure time: 0.8   ISO: 400   F-number: 2.8
Focal length: 33.8 mm   (35 mm equivalent)
Exposure compensation: 1
White
Screen photo
[open image]
Luminance 339 cd/m2
Luminance spread 59 cd/m2 (2 standard deviations)
Exposure value –0.99 stops   (aim for –2 to –3)
Exposure spread 0.25 stops
Area used for calculation 0.488 x 0.488
Camera settings Exposure time: 1/403   ISO: 400   F-number: 2.8
Focal length: 33.8 mm   (35 mm equivalent)
Exposure compensation: 2
Black at screen edge
Screen photo
[open image]
Luminance 0.35 cd/m2
Luminance spread 0.14 cd/m2 (2 standard deviations)
Exposure value –2.57 stops   (aim for –2 to –3)
Exposure spread 0.6 stops
Area used for calculation 0.488 x 0.488
Camera settings Exposure time: 0.8   ISO: 400   F-number: 2.8
Focal length: 33.8 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.