Contrast ratio results

Contrast ratio 4786:1
Monitor model
Submitted 05 Sep 2019 01:30 CEST, by 37.201.*.*
Camera model Lenovo L38041
Processing remarks

Warning: image file 1: camera was zoomed out too much.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 27.4 s (Set EV to +6.8)
Warning: image file 2: camera was zoomed out too much.
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/170 s (Set EV to +1.5)

Black
Screen photo
Luminance 0.01 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –9.27 stops   (aim for –2 to –3)
Exposure spread 0.37 stops
Area used for calculation 0.1 x 0.133
Camera settings Exposure time: 1/4   ISO: 400   F-number: 2
Focal length: 5 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 26 cd/m2
Luminance spread 1 cd/m2 (2 standard deviations)
Exposure value –4.02 stops   (aim for –2 to –3)
Exposure spread 0.08 stops
Area used for calculation 0.1 x 0.133
Camera settings Exposure time: 1/501   ISO: 400   F-number: 2
Focal length: 5 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.