Contrast ratio results for Apple

Black
Contrast ratio	329:1
Monitor model	Apple
Submitted	13 Feb 2021 20:23 CET, by 176.231..
Camera model	Nikon Z 7
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: 0.5 s (Set EV to +5.4) Warning: image file 2: automatic white balance can cause inaccuracies. Warning: image file 2: Overexposed. Please decrease the shutter time.
Screen photo	[open image]
Luminance	0.91 cd/m2
Luminance spread	0.71 cd/m2 (2 standard deviations)
Exposure value	–8.87 stops (aim for –2 to –3)
Exposure spread	1.18 stops
Area used for calculation	0.389 x 0.437
Camera settings	Exposure time: 1/160 ISO: 800 F-number: 5 Focal length: 28 mm (35 mm equivalent) Exposure compensation: -1
White
Screen photo	[open image]
Luminance	301 cd/m2
Luminance spread	17 cd/m2 (2 standard deviations)
Exposure value	–0.51 stops (aim for –2 to –3)
Exposure spread	0.08 stops
Area used for calculation	0.389 x 0.437
Camera settings	Exposure time: 1/160 ISO: 800 F-number: 5 Focal length: 28 mm (35 mm equivalent) Exposure compensation: -1

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.