Contrast ratio results

Contrast ratio 1244:1
Monitor model
Submitted 06 Nov 2009 05:19 CET, by 174.44.*.*
Camera model Nikon D40
Processing remarks

Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 7.2 s (Set EV to +7.2)

Black
Screen photo
Luminance 0.17 cd/m2
Luminance spread 0.12 cd/m2 (2 standard deviations)
Exposure value –4.66 stops   (aim for –2 to –3)
Exposure spread 1.14 stops
Area used for calculation 0.375 x 0.423
Camera settings Exposure time: 1.6   ISO: 400   F-number: 5.6
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: 5
White
Screen photo
Luminance 206 cd/m2
Luminance spread 71 cd/m2 (2 standard deviations)
Exposure value –2.03 stops   (aim for –2 to –3)
Exposure spread 0.5 stops
Area used for calculation 0.375 x 0.423
Camera settings Exposure time: 1/125   ISO: 400   F-number: 5.6
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: 5

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.