Contrast ratio results for Dell U2718Q

Black
Contrast ratio	9595:1
Monitor model	Dell U2718Q
Submitted	07 Mar 2018 13:18 CET, by 118.148..
Camera model	Apple iPhone 6s Plus
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 3.6 s (Set EV to +5.7) Warning: image file 2: automatic white balance can cause inaccuracies. Warning: image file 2: Overexposed. Please decrease the shutter time. Note: image file 2: suggested exposure time: 1/67 s (Set EV to -2.0) Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0.01 cd/m2
Luminance spread	0.01 cd/m2 (2 standard deviations)
Exposure value	–6.33 stops (aim for –2 to –3)
Exposure spread	0.73 stops
Area used for calculation	0.419 x 0.419
Camera settings	Exposure time: 1/4 ISO: 1600 F-number: 2.2 Focal length: 29 mm (35 mm equivalent) Exposure compensation: 1.82
White
Screen photo	[open image]
Luminance	123 cd/m2
Luminance spread	7 cd/m2 (2 standard deviations)
Exposure value	–0.51 stops (aim for –2 to –3)
Exposure spread	0.09 stops
Area used for calculation	0.419 x 0.419
Camera settings	Exposure time: 1/17 ISO: 40 F-number: 2.2 Focal length: 29 mm (35 mm equivalent) Exposure compensation: 0

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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.