Contrast ratio results

Contrast ratio 894:1
Monitor model
Submitted 06 Nov 2009 05:03 CET, by 174.44.*.*
Camera model Nikon D40
Processing remarks

Warning: image file 1: camera was zoomed in too much.
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: 1/34 s (Set EV to +8.6)
Warning: image file 2: camera was zoomed in too much.
Warning: image file 2: automatic white balance can cause inaccuracies.
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 26.5 s (Set EV to +9.3)

Black
Screen photo
Luminance 0.04 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –6.85 stops   (aim for –2 to –3)
Exposure spread 0.56 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1.3   ISO: 400   F-number: 5.6
Focal length: 82 mm   (35 mm equivalent)
Exposure compensation: 5
White
Screen photo
Luminance 40 cd/m2
Luminance spread 21 cd/m2 (2 standard deviations)
Exposure value –6.06 stops   (aim for –2 to –3)
Exposure spread 0.76 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/400   ISO: 400   F-number: 5.6
Focal length: 82 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.