Contrast ratio results for Samsung CF390

Contrast ratio 4503:1 (edge: 2840:1)
Monitor model Samsung CF390
Submitted 24 May 2018 02:46 CEST, by 104.184.*.*
Camera model samsung SM-G920P
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 17.6 s (Set EV to +4.1)
Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 11.1 s (Set EV to +3.5)

Black
Screen photo
Luminance 0.01 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –6.63 stops   (aim for –2 to –3)
Exposure spread 3.26 stops
Area used for calculation 0.371 x 0.495
Camera settings Exposure time: 1   ISO: 400   F-number: 1.9
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 35 cd/m2
Luminance spread 12 cd/m2 (2 standard deviations)
Exposure value –2.95 stops   (aim for –2 to –3)
Exposure spread 0.49 stops
Area used for calculation 0.371 x 0.495
Camera settings Exposure time: 1/350   ISO: 400   F-number: 1.9
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 0.01 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –5.97 stops   (aim for –2 to –3)
Exposure spread 4.15 stops
Area used for calculation 0.371 x 0.495
Camera settings Exposure time: 1   ISO: 400   F-number: 1.9
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.