Contrast ratio results

Contrast ratio 9824:1
Monitor model
Submitted 03 May 2023 15:36 CEST, by 94.158.*.*
Camera model Canon EOS 650D
Processing remarks

Warning: image file 1: camera was zoomed in too much.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 45.9 s (Set EV to +8.5)
Warning: image file 2: camera was zoomed in too much.
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/210 s (Set EV to -2.4)

Black
Screen photo
Luminance 0.03 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –11.02 stops   (aim for –2 to –3)
Exposure spread 3.26 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/8   ISO: 100   F-number: 2.8
Focal length: 79.2 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 254 cd/m2
Luminance spread 9 cd/m2 (2 standard deviations)
Exposure value –0.12 stops   (aim for –2 to –3)
Exposure spread 0.05 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/41   ISO: 100   F-number: 2.8
Focal length: 79.2 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.