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Contrast ratio of Lenovo Thinkpad S430

Contrast ratio 351:1 (edge: 442:1)
Monitor model Lenovo Thinkpad S430
Submitted 03 Jan 2013 10:33 CET, by 199.58.*.*
Camera model Canon EOS 600D
Processing remarks


Black
Screen photo
[open image]
Luminance 0.95 cd/m2
Luminance spread 1.66 cd/m2 (2 standard deviations)
Exposure value –2.79 stops   (aim for –2 to –3)
Exposure spread 3.88 stops
Area used for calculation 0.393 x 0.442
Camera settings Exposure time: 0.4   ISO: 400   F-number: 3.5
Focal length: 28.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 332 cd/m2
Luminance spread 178 cd/m2 (2 standard deviations)
Exposure value –1.39 stops   (aim for –2 to –3)
Exposure spread 0.79 stops
Area used for calculation 0.393 x 0.442
Camera settings Exposure time: 1/332   ISO: 400   F-number: 3.5
Focal length: 28.3 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0.75 cd/m2
Luminance spread 1.36 cd/m2 (2 standard deviations)
Exposure value –3.12 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.393 x 0.442
Camera settings Exposure time: 0.4   ISO: 400   F-number: 3.5
Focal length: 28.3 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.