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Contrast ratio of Apple Macbook Air 13 2011

Contrast ratio 510:1
Monitor model Apple Macbook Air 13 2011
Submitted 17 May 2012 15:47 CEST, by 2.109.*.*
Camera model Panasonic DMC-GF1
Processing remarks

Note: image file 1: suggested exposure time: 0.9 s (Set EV to -1.5)

Black
Screen photo
[open image]
Luminance 0.12 cd/m2
Luminance spread 0.08 cd/m2 (2 standard deviations)
Exposure value –1 stops   (aim for –2 to –3)
Exposure spread 0.95 stops
Area used for calculation 0.578 x 0.578
Camera settings Exposure time: 2.5   ISO: 400   F-number: 1.7
Focal length: 40 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 63 cd/m2
Luminance spread 25 cd/m2 (2 standard deviations)
Exposure value –1.97 stops   (aim for –2 to –3)
Exposure spread 0.58 stops
Area used for calculation 0.578 x 0.578
Camera settings Exposure time: 1/400   ISO: 400   F-number: 1.7
Focal length: 40 mm   (35 mm equivalent)
Exposure compensation: 0
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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.