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Contrast ratio of Lenovo X121e

Contrast ratio 95:1
Monitor model Lenovo X121e
Submitted 03 Jun 2012 21:35 CEST, by 79.182.*.*
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.
Note: image file 1: suggested exposure time: 0.5 s (Set EV to +1.1)
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.

Black
Screen photo
[open image]
Luminance 2.16 cd/m2
Luminance spread 5.98 cd/m2 (2 standard deviations)
Exposure value –3.64 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.45 x 0.506
Camera settings Exposure time: 1/4   ISO: 100   F-number: 2.8
Focal length: 32.4 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 205 cd/m2
Luminance spread 75 cd/m2 (2 standard deviations)
Exposure value –1.69 stops   (aim for –2 to –3)
Exposure spread 0.53 stops
Area used for calculation 0.45 x 0.506
Camera settings Exposure time: 1/99   ISO: 100   F-number: 2.8
Focal length: 32.4 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.