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

Contrast ratio results

Contrast ratio 929:1
Monitor model
Submitted 08 Feb 2010 06:29 CET, by 207.68.*.*
Camera model Canon EOS 40D
Processing remarks

Note: image file 1: suggested exposure time: 6.7 s (Set EV to +1.4)

Black
Screen photo
[open image]
Luminance 0.18 cd/m2
Luminance spread 0.19 cd/m2 (2 standard deviations)
Exposure value –3.91 stops   (aim for –2 to –3)
Exposure spread 1.69 stops
Area used for calculation 0.45 x 0.506
Camera settings Exposure time: 2.5   ISO: 400   F-number: 5.6
Focal length: 32.4 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 165 cd/m2
Luminance spread 47 cd/m2 (2 standard deviations)
Exposure value –2.02 stops   (aim for –2 to –3)
Exposure spread 0.42 stops
Area used for calculation 0.45 x 0.506
Camera settings Exposure time: 1/100   ISO: 400   F-number: 5.6
Focal length: 32.4 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.