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

Contrast ratio results

Contrast ratio 309:1
Monitor model
Submitted 17 Feb 2013 02:17 CET, by 121.44.*.*
Camera model Canon EOS 600D
Processing remarks

Note: image file 2: suggested exposure time: 1/190 s (Set EV to +1.1)

Black
Screen photo
[open image]
Luminance 0.49 cd/m2
Luminance spread 0.32 cd/m2 (2 standard deviations)
Exposure value –3.2 stops   (aim for –2 to –3)
Exposure spread 0.97 stops
Area used for calculation 0.546 x 0.614
Camera settings Exposure time: 1   ISO: 400   F-number: 4.6
Focal length: 39.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 152 cd/m2
Luminance spread 139 cd/m2 (2 standard deviations)
Exposure value –3.56 stops   (aim for –2 to –3)
Exposure spread 1.43 stops
Area used for calculation 0.546 x 0.614
Camera settings Exposure time: 1/395   ISO: 400   F-number: 4.6
Focal length: 39.3 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.