Contrast ratio results

Contrast ratio 923:1
Monitor model
Submitted 03 Apr 2011 17:48 CEST, by 68.41.*.*
Camera model Pentax K20D
Processing remarks


Black
Screen photo
Luminance 0.1 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –2.43 stops   (aim for –2 to –3)
Exposure spread 0.27 stops
Area used for calculation 0.721 x 0.814
Camera settings Exposure time: 2   ISO: 1   F-number: 4.5
Focal length: 52 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 93 cd/m2
Luminance spread 61 cd/m2 (2 standard deviations)
Exposure value –2.54 stops   (aim for –2 to –3)
Exposure spread 0.98 stops
Area used for calculation 0.721 x 0.814
Camera settings Exposure time: 1/500   ISO: 1   F-number: 4.5
Focal length: 52 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.