Contrast ratio results

Contrast ratio 49:1
Monitor model
Submitted 21 Nov 2009 08:36 CET, by 79.166.*.*
Camera model Nikon D300
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 1.0 s (Set EV to +1.8)
Warning: image file 2: automatic white balance can cause inaccuracies.
Note: image file 2: suggested exposure time: 1/49 s (Set EV to -1.3)

Black
Screen photo
Luminance 1.16 cd/m2
Luminance spread 1.16 cd/m2 (2 standard deviations)
Exposure value –4.26 stops   (aim for –2 to –3)
Exposure spread 1.57 stops
Area used for calculation 0.499 x 0.564
Camera settings Exposure time: 0.3   ISO: 400   F-number: 5.6
Focal length: 36 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 57 cd/m2
Luminance spread 15 cd/m2 (2 standard deviations)
Exposure value –1.22 stops   (aim for –2 to –3)
Exposure spread 0.38 stops
Area used for calculation 0.499 x 0.564
Camera settings Exposure time: 1/20   ISO: 400   F-number: 5.6
Focal length: 36 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.