Contrast ratio results for MacBook

Contrast ratio 694:1
Monitor model MacBook
Submitted 28 Feb 2008 17:15 CET, by 82.75.*.*
Camera model Canon EOS 20D
Processing remarks

Warning: image file 1: camera was zoomed in too much.
Warning: image file 2: camera was zoomed in too much.
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.

Black
Screen photo
Luminance 0.3 cd/m2
Luminance spread 0.09 cd/m2 (2 standard deviations)
Exposure value –3.05 stops   (aim for –2 to –3)
Exposure spread 0.43 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 0.7   ISO: 800   F-number: 4
Focal length: 312.5 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 205 cd/m2
Luminance spread 57 cd/m2 (2 standard deviations)
Exposure value –2.64 stops   (aim for –2 to –3)
Exposure spread 0.4 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/750   ISO: 800   F-number: 4
Focal length: 312.5 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.