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Contrast ratio results for Lenovo X121e

Contrast ratio 65:1
Monitor model Lenovo X121e
Submitted 02 Jun 2012 22:48 CEST, by 79.177.*.*
Camera model Canon EOS 40D
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.

Black
Screen photo
[open image]
Luminance 2.97 cd/m2
Luminance spread 7.28 cd/m2 (2 standard deviations)
Exposure value –3.18 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.585 x 0.657
Camera settings Exposure time: 1/4   ISO: 100   F-number: 2.8
Focal length: 42.1 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 192 cd/m2
Luminance spread 136 cd/m2 (2 standard deviations)
Exposure value –1.53 stops   (aim for –2 to –3)
Exposure spread 1.07 stops
Area used for calculation 0.585 x 0.657
Camera settings Exposure time: 1/83   ISO: 100   F-number: 2.8
Focal length: 42.1 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.