Contrast ratio results

Contrast ratio 5628:1
Monitor model
Submitted 27 Dec 2022 14:22 CET, by 104.28.*.*
Camera model ZTE Blade A51
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: 2.3 s (Set EV to +3.5)
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.

Black
Screen photo
Luminance 0.11 cd/m2
Luminance spread 0.09 cd/m2 (2 standard deviations)
Exposure value –6.04 stops   (aim for –2 to –3)
Exposure spread 1.25 stops
Area used for calculation 0.528 x 0.704
Camera settings Exposure time: 1/5   ISO: 400   F-number: 2.6
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 620 cd/m2
Luminance spread 204 cd/m2 (2 standard deviations)
Exposure value –1.24 stops   (aim for –2 to –3)
Exposure spread 0.48 stops
Area used for calculation 0.528 x 0.704
Camera settings Exposure time: 1/1010   ISO: 400   F-number: 2.6
Focal length: 0 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.