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Contrast ratio results for LG 28" 4k

Contrast ratio 2570:1 (edge: 1915:1)
Monitor model LG 28" 4k
Submitted 18 Feb 2018 04:29 CET, by 73.68.*.*
Camera model Sony SLT-A58
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 105.2 s (Set EV to +4.4)
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/24 s (Set EV to +1.7)
Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 78.5 s (Set EV to +4.3)

Black
Screen photo
[open image]
Luminance 0.04 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –9.22 stops   (aim for –2 to –3)
Exposure spread 1.68 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1   ISO: 400   F-number: 10
Focal length: 75 mm   (35 mm equivalent)
Exposure compensation: -2.3
White
Screen photo
[open image]
Luminance 92 cd/m2
Luminance spread 23 cd/m2 (2 standard deviations)
Exposure value –6.53 stops   (aim for –2 to –3)
Exposure spread 0.36 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/400   ISO: 400   F-number: 10
Focal length: 75 mm   (35 mm equivalent)
Exposure compensation: -2.3
Black at screen edge
Screen photo
[open image]
Luminance 0.05 cd/m2
Luminance spread 0.07 cd/m2 (2 standard deviations)
Exposure value –9.12 stops   (aim for –2 to –3)
Exposure spread 2.59 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 0.8   ISO: 400   F-number: 10
Focal length: 75 mm   (35 mm equivalent)
Exposure compensation: -2.3

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.