Contrast ratio results for BenQ XL2411P

Black
Contrast ratio	4.6587e+07:1
Monitor model	BenQ XL2411P
Submitted	09 Dec 2019 15:02 CET, by 83.245..
Camera model	HUAWEI COR-L29
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. Note: image file 1: suggested exposure time: 1/120 s (Set EV to +23.0) 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. Warning: image file 2: Overexposed. Please decrease the shutter time. Warning: image file 3: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	89 cd/m2
Luminance spread	9320 cd/m2 (2 standard deviations)
Exposure value	–25.47 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.39 x 0.39
Camera settings	Exposure time: 1/99996336 ISO: 100 F-number: 2.2 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	4.13805e+09 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–-0 stops (aim for –2 to –3)
Exposure spread	0 stops
Area used for calculation	0.39 x 0.39
Camera settings	Exposure time: 1/99996336 ISO: 100 F-number: 2.2 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	1.55096e+09 cd/m2
Luminance spread	2.72193e+09 cd/m2 (2 standard deviations)
Exposure value	–1.42 stops (aim for –2 to –3)
Exposure spread	3.94 stops
Area used for calculation	0.415 x 0.355
Camera settings	Exposure time: 1/99996336 ISO: 100 F-number: 2.2 Focal length: 27 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.