Contrast ratio results

Contrast ratio 54908:1
Monitor model
Submitted 15 Aug 2019 15:23 CEST, by 5.168.*.*
Camera model HUAWEI CLT-L29
Processing remarks

Warning: image file 1: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Warning: image file 1: Underexposed. Please increase the shutter time.
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.

Black
Screen photo
Luminance 7710 cd/m2
Luminance spread 16803 cd/m2 (2 standard deviations)
Exposure value –16.45 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.441 x 0.331
Camera settings Exposure time: 1/99996336   ISO: 400   F-number: 1.8
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 4.23368e+08 cd/m2
Luminance spread 6.51476e+07 cd/m2 (2 standard deviations)
Exposure value –0.71 stops   (aim for –2 to –3)
Exposure spread 0.22 stops
Area used for calculation 0.445 x 0.328
Camera settings Exposure time: 1/99996336   ISO: 400   F-number: 1.8
Focal length: 27 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.