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

Contrast ratio results

Contrast ratio 296:1
Monitor model
Submitted 29 Dec 2010 19:25 CET, by 74.128.*.*
Camera model Canon EOS 20D
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 2: automatic white balance can cause inaccuracies.

Black
Screen photo
[open image]
Luminance 1.08 cd/m2
Luminance spread 0.18 cd/m2 (2 standard deviations)
Exposure value –2.27 stops   (aim for –2 to –3)
Exposure spread 0.24 stops
Area used for calculation 0.607 x 0.683
Camera settings Exposure time: 0.5   ISO: 400   F-number: 3.5
Focal length: 43.7 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 321 cd/m2
Luminance spread 69 cd/m2 (2 standard deviations)
Exposure value –1.03 stops   (aim for –2 to –3)
Exposure spread 0.31 stops
Area used for calculation 0.607 x 0.683
Camera settings Exposure time: 1/250   ISO: 400   F-number: 3.5
Focal length: 43.7 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.