Contrast ratio results for Asus VG248

Contrast ratio 393:1 (edge: 393:1)
Monitor model Asus VG248
Submitted 09 Jan 2015 08:39 CET, by 70.170.*.*
Camera model Canon EOS REBEL T3i
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 1: Overexposed. Please decrease the shutter time.
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.
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: Overexposed. Please decrease the shutter time.

Black
Screen photo
Luminance 0.29 cd/m2
Luminance spread 0.74 cd/m2 (2 standard deviations)
Exposure value –2.84 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/5   ISO: 400   F-number: 1.4
Focal length: 78.6 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 115 cd/m2
Luminance spread 159 cd/m2 (2 standard deviations)
Exposure value –2.27 stops   (aim for –2 to –3)
Exposure spread 2.44 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/1328   ISO: 400   F-number: 1.4
Focal length: 78.6 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 0.29 cd/m2
Luminance spread 0.74 cd/m2 (2 standard deviations)
Exposure value –2.84 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/5   ISO: 400   F-number: 1.4
Focal length: 78.6 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.