Contrast ratio results

Black
Contrast ratio	13946:1
Monitor model
Submitted	16 Apr 2016 16:05 CEST, by 125.254..
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: 12.5 s (Set EV to +4.6) 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: 1/450 s (Set EV to -2.2) Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0.07 cd/m2
Luminance spread	0.08 cd/m2 (2 standard deviations)
Exposure value	–10.23 stops (aim for –2 to –3)
Exposure spread	1.88 stops
Area used for calculation	0.419 x 0.419
Camera settings	Exposure time: 1/17 ISO: 80 F-number: 2.2 Focal length: 29 mm (35 mm equivalent) Exposure compensation: -3.09
White
Screen photo	[open image]
Luminance	1022 cd/m2
Luminance spread	176 cd/m2 (2 standard deviations)
Exposure value	–0.34 stops (aim for –2 to –3)
Exposure spread	0.25 stops
Area used for calculation	0.419 x 0.419
Camera settings	Exposure time: 1/100 ISO: 32 F-number: 2.2 Focal length: 29 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.