Contrast ratio results

Contrast ratio 9390:1
Monitor model
Submitted 17 Feb 2015 10:44 CET, by 178.59.*.*
Camera model Nikon D3X
Processing remarks

image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 2: camera was zoomed in too much.
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 1/22 s (Set EV to +0.9)
Warning: Image ISO settings are not the same.
Warning: Image F-number settings are not the same.
Warning: Images were taken with different cameras.
Warning: Image focal lengths/zoom levels are not the same.
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
Luminance 2.02 cd/m2
Luminance spread 6.07 cd/m2 (2 standard deviations)
Exposure value –3.37 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.806 x 0.906
Camera settings Exposure time: 1/50   ISO: 1600   F-number: 2.8
Focal length: 58 mm   (35 mm equivalent)
Exposure compensation: -2
White
Screen photo
Luminance 19011 cd/m2
Luminance spread 11744 cd/m2 (2 standard deviations)
Exposure value –0.54 stops   (aim for –2 to –3)
Exposure spread 0.92 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/200   ISO: 50   F-number: 9
Focal length: 175 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 2746 cd/m2
Luminance spread 10165 cd/m2 (2 standard deviations)
Exposure value –4.39 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.999 x 1
Camera settings Exposure time: 1/80   ISO: 100   F-number: 29
Focal length: 72 mm   (35 mm equivalent)
Exposure compensation: -1

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.