Contrast ratio results

Contrast ratio 647:1
Monitor model
Submitted 26 Mar 2011 20:19 CET, by 77.124.*.*
Camera model Canon EOS 5D Mark II
Processing remarks

Note: image file 1: suggested exposure time: 5.5 s (Set EV to +1.5)
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
Luminance 0.11 cd/m2
Luminance spread 0.05 cd/m2 (2 standard deviations)
Exposure value –3.97 stops   (aim for –2 to –3)
Exposure spread 0.66 stops
Area used for calculation 0.325 x 0.366
Camera settings Exposure time: 2   ISO: 400   F-number: 4
Focal length: 23.4 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 71 cd/m2
Luminance spread 66 cd/m2 (2 standard deviations)
Exposure value –2.63 stops   (aim for –2 to –3)
Exposure spread 1.47 stops
Area used for calculation 0.325 x 0.366
Camera settings Exposure time: 1/128   ISO: 400   F-number: 4
Focal length: 23.4 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 44 cd/m2
Luminance spread 74 cd/m2 (2 standard deviations)
Exposure value –1.79 stops   (aim for –2 to –3)
Exposure spread 3.44 stops
Area used for calculation 0.325 x 0.366
Camera settings Exposure time: 1/45   ISO: 400   F-number: 4
Focal length: 23.4 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.