Contrast ratio results for Thinkpad

Black
Contrast ratio	51:1
Monitor model	Thinkpad
Submitted	20 Jun 2018 10:50 CEST, by 115.228..
Camera model	HUAWEI BKL-AL00
Processing remarks	Warning: image file 1: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. Warning: image file 1: automatic white balance can cause inaccuracies. Warning: image file 1: Underexposed. Please increase the shutter time. Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. Warning: image file 2: automatic white balance can cause inaccuracies.
Screen photo	[open image]
Luminance	6.03469e+06 cd/m2
Luminance spread	2.88823e+06 cd/m2 (2 standard deviations)
Exposure value	–6.84 stops (aim for –2 to –3)
Exposure spread	0.7 stops
Area used for calculation	0.349 x 0.523
Camera settings	Exposure time: 1/99996336 ISO: 400 F-number: 1.8 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	3.08128e+08 cd/m2
Luminance spread	1.03444e+08 cd/m2 (2 standard deviations)
Exposure value	–1.17 stops (aim for –2 to –3)
Exposure spread	0.49 stops
Area used for calculation	0.349 x 0.523
Camera settings	Exposure time: 1/99996336 ISO: 400 F-number: 1.8 Focal length: 27 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.