Contrast ratio results

Contrast ratio 5984:1
Monitor model
Submitted 24 Jun 2021 21:31 CEST, by 5.38.*.*
Camera model Apple iPhone 8
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 2.5 s (Set EV to +5.2)
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Warning: image file 2: Overexposed. Please decrease the shutter time.

Black
Screen photo
Luminance 0.05 cd/m2
Luminance spread 0.03 cd/m2 (2 standard deviations)
Exposure value –7.71 stops   (aim for –2 to –3)
Exposure spread 0.78 stops
Area used for calculation 0.365 x 0.527
Camera settings Exposure time: 1/15   ISO: 400   F-number: 1.8
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 296 cd/m2
Luminance spread 36 cd/m2 (2 standard deviations)
Exposure value –0.35 stops   (aim for –2 to –3)
Exposure spread 0.17 stops
Area used for calculation 0.38 x 0.464
Camera settings Exposure time: 1/546   ISO: 400   F-number: 1.8
Focal length: 28 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.