Contrast ratio results

Contrast ratio 488:1
Monitor model
Submitted 07 Aug 2010 18:31 CEST, by 84.49.*.*
Camera model Canon EOS 7D
Processing remarks

Warning: image file 1: camera was zoomed out too much.
Warning: image file 2: camera was zoomed out too much.
Note: image file 2: suggested exposure time: 1/91 s (Set EV to -1.2)

Black
Screen photo
Luminance 0.23 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –1.92 stops   (aim for –2 to –3)
Exposure spread 0.12 stops
Area used for calculation 0.1 x 0.113
Camera settings Exposure time: 8   ISO: 400   F-number: 5.7
Focal length: 1.5 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 112 cd/m2
Luminance spread 11 cd/m2 (2 standard deviations)
Exposure value –1.34 stops   (aim for –2 to –3)
Exposure spread 0.14 stops
Area used for calculation 0.1 x 0.113
Camera settings Exposure time: 1/41   ISO: 400   F-number: 5.7
Focal length: 1.5 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.