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Contrast ratio of Lenovo R500

Contrast ratio 272:1
Monitor model Lenovo R500
Submitted 29 Oct 2010 22:21 CEST, by 77.240.*.*
Camera model Panasonic DMC-FZ28
Processing remarks

Note: image file 1: suggested exposure time: 2.2 s (Set EV to +1.2)
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 0.13 cd/m2
Luminance spread 0.27 cd/m2 (2 standard deviations)
Exposure value –3.65 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.39 x 0.39
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 36 cd/m2
Luminance spread 5 cd/m2 (2 standard deviations)
Exposure value –2.21 stops   (aim for –2 to –3)
Exposure spread 0.22 stops
Area used for calculation 0.39 x 0.39
Camera settings Exposure time: 1/100   ISO: 400   F-number: 2.8
Focal length: 27 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.