Contrast ratio of Thinkpad Edge 11

Contrast ratio 255:1
Monitor model Thinkpad Edge 11
Submitted 06 May 2012 23:54 CEST, by 83.161.*.*
Camera model Canon PowerShot A540
Processing remarks


Black
Screen photo
Luminance 0.79 cd/m2
Luminance spread 1.17 cd/m2 (2 standard deviations)
Exposure value –2.87 stops   (aim for –2 to –3)
Exposure spread 2.75 stops
Area used for calculation 0.495 x 0.495
Camera settings Exposure time: 1   ISO: 100   F-number: 2.6
Focal length: 34.3 mm   (35 mm equivalent)
Exposure compensation: 1
White
Screen photo
Luminance 201 cd/m2
Luminance spread 28 cd/m2 (2 standard deviations)
Exposure value –1.85 stops   (aim for –2 to –3)
Exposure spread 0.2 stops
Area used for calculation 0.495 x 0.495
Camera settings Exposure time: 1/125   ISO: 100   F-number: 2.6
Focal length: 34.3 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.