Contrast ratio | Test results | LCD test | Small-screen tests | Lagom home

Contrast ratio results for LG 29UM68

Contrast ratio 165:1 (edge: 146:1)
Monitor model LG 29UM68
Submitted 21 Oct 2019 16:58 CEST, by 197.185.*.*
Camera model Panasonic DC-GH5
Processing remarks

Warning: Image F-number settings are not the same.

Black
Screen photo
[open image]
Luminance 0.78 cd/m2
Luminance spread 0.11 cd/m2 (2 standard deviations)
Exposure value –2.46 stops   (aim for –2 to –3)
Exposure spread 0.21 stops
Area used for calculation 0.345 x 0.46
Camera settings Exposure time: 1   ISO: 400   F-number: 4.5
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 130 cd/m2
Luminance spread 13 cd/m2 (2 standard deviations)
Exposure value –2.37 stops   (aim for –2 to –3)
Exposure spread 0.15 stops
Area used for calculation 0.345 x 0.46
Camera settings Exposure time: 1/400   ISO: 400   F-number: 2.8
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0.89 cd/m2
Luminance spread 0.26 cd/m2 (2 standard deviations)
Exposure value –2.29 stops   (aim for –2 to –3)
Exposure spread 0.43 stops
Area used for calculation 0.345 x 0.46
Camera settings Exposure time: 1   ISO: 400   F-number: 4.5
Focal length: 26 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.