Contrast ratio results

Contrast ratio 233:1
Monitor model
Submitted 14 Apr 2008 23:19 CEST, by 78.51.*.*
Camera model Canon EOS 30D
Processing remarks

Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.

Black
Screen photo
Luminance 0.9 cd/m2
Luminance spread 0.5 cd/m2 (2 standard deviations)
Exposure value –2.89 stops   (aim for –2 to –3)
Exposure spread 0.82 stops
Area used for calculation 0.369 x 0.416
Camera settings Exposure time: 1/4   ISO: 400   F-number: 2.8
Focal length: 26.6 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 210 cd/m2
Luminance spread 21 cd/m2 (2 standard deviations)
Exposure value –2.35 stops   (aim for –2 to –3)
Exposure spread 0.14 stops
Area used for calculation 0.369 x 0.416
Camera settings Exposure time: 1/640   ISO: 400   F-number: 2.8
Focal length: 26.6 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.