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

Contrast ratio results

Contrast ratio 1020:1
Monitor model
Submitted 22 Dec 2020 11:08 CET, by 84.248.*.*
Camera model Nikon D40
Processing remarks

Note: image file 1: suggested exposure time: 3.0 s (Set EV to -1.4)
Note: image file 2: suggested exposure time: 1/350 s (Set EV to -1.5)
Warning: Image focal lengths/zoom levels are not the same.

Black
Screen photo
[open image]
Luminance 0.15 cd/m2
Luminance spread 0.05 cd/m2 (2 standard deviations)
Exposure value –1.06 stops   (aim for –2 to –3)
Exposure spread 0.47 stops
Area used for calculation 0.722 x 0.814
Camera settings Exposure time: 8   ISO: 800   F-number: 4.8
Focal length: 52 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 150 cd/m2
Luminance spread 32 cd/m2 (2 standard deviations)
Exposure value –1.03 stops   (aim for –2 to –3)
Exposure spread 0.31 stops
Area used for calculation 0.791 x 0.892
Camera settings Exposure time: 1/125   ISO: 800   F-number: 4.8
Focal length: 57 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.