Contrast ratio results

Black
Contrast ratio	167082:1
Monitor model
Submitted	12 Mar 2019 18:54 CET, by 188.146..
Camera model	Apple iPhone 6s
Processing remarks	Warning: image file 1: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 5918.2 s (Set EV to +22.1) Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0.01 cd/m2 (2 standard deviations)
Exposure value	–24.62 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.419 x 0.419
Camera settings	Exposure time: 1/769 ISO: 25 F-number: 2.2 Focal length: 29 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	83 cd/m2
Luminance spread	31 cd/m2 (2 standard deviations)
Exposure value	–3.27 stops (aim for –2 to –3)
Exposure spread	0.54 stops
Area used for calculation	0.419 x 0.419
Camera settings	Exposure time: 1/769 ISO: 400 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.