Contrast ratio results for Lenovo

Black
Contrast ratio	491:1
Monitor model	Lenovo
Submitted	14 Apr 2020 13:00 CEST, by 80.212..
Camera model	motorola moto g6 plus
Processing remarks	Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Warning: image file 1: automatic white balance can cause inaccuracies. Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Warning: image file 2: automatic white balance can cause inaccuracies.
Screen photo	[open image]
Luminance	0.29 cd/m2
Luminance spread	0.29 cd/m2 (2 standard deviations)
Exposure value	–2.82 stops (aim for –2 to –3)
Exposure spread	1.56 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 0.3 ISO: 400 F-number: 1.7 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	143 cd/m2
Luminance spread	14 cd/m2 (2 standard deviations)
Exposure value	–0.6 stops (aim for –2 to –3)
Exposure spread	0.14 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1/351 ISO: 400 F-number: 1.7 Focal length: 0 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.