Contrast ratio results for hp 2311gt

Contrast ratio 2924:1
Monitor model hp 2311gt
Submitted 02 Oct 2016 16:07 CEST, by 88.233.*.*
Camera model Canon EOS 6D
Processing remarks

Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 10.6 s (Set EV to +6.8)
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Note: image file 2: suggested exposure time: 1/140 s (Set EV to -1.5)
Warning: image file 3: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: Image F-number settings 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 0.06 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –12.28 stops   (aim for –2 to –3)
Exposure spread 1.66 stops
Area used for calculation 0.528 x 0.965
Camera settings Exposure time: 1/83   ISO: 400   F-number: 4
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: -3
White
Screen photo
Luminance 167 cd/m2
Luminance spread 23 cd/m2 (2 standard deviations)
Exposure value –1.02 stops   (aim for –2 to –3)
Exposure spread 0.2 stops
Area used for calculation 0.528 x 0.907
Camera settings Exposure time: 1/49   ISO: 400   F-number: 5.7
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 56 cd/m2
Luminance spread 113 cd/m2 (2 standard deviations)
Exposure value –3.35 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.528 x 0.954
Camera settings Exposure time: 1/166   ISO: 400   F-number: 4
Focal length: 0 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.