Contrast ratio results

Contrast ratio 2:1
Monitor model
Submitted 14 Nov 2016 07:55 CET, by 37.29.*.*
Camera model Canon EOS 5D Mark II
Processing remarks

Warning: image file 1: camera was zoomed in too much.
Warning: image file 1: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
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 1: Overexposed. Please decrease the shutter time.
Warning: image file 2: camera was zoomed in too much.
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: Image ISO settings are not the same.

Black
Screen photo
Luminance 2311 cd/m2
Luminance spread 1985 cd/m2 (2 standard deviations)
Exposure value –0.92 stops   (aim for –2 to –3)
Exposure spread 1.33 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/640   ISO: 200   F-number: 4
Focal length: 244 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 4262 cd/m2
Luminance spread 4216 cd/m2 (2 standard deviations)
Exposure value –1 stops   (aim for –2 to –3)
Exposure spread 1.56 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/1000   ISO: 160   F-number: 4
Focal length: 244 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.