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

Contrast ratio results

Contrast ratio 549:1
Monitor model
Submitted 30 Jul 2009 02:41 CEST, by 24.171.*.*
Camera model Canon EOS DIGITAL REBEL XT
Processing remarks

Note: image file 2: suggested exposure time: 1/200 s (Set EV to +0.7)

Black
Screen photo
[open image]
Luminance 0.17 cd/m2
Luminance spread 0.08 cd/m2 (2 standard deviations)
Exposure value –2.96 stops   (aim for –2 to –3)
Exposure spread 0.71 stops
Area used for calculation 0.521 x 0.586
Camera settings Exposure time: 2   ISO: 400   F-number: 3.5
Focal length: 37.5 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 92 cd/m2
Luminance spread 6 cd/m2 (2 standard deviations)
Exposure value –1.18 stops   (aim for –2 to –3)
Exposure spread 0.09 stops
Area used for calculation 0.521 x 0.586
Camera settings Exposure time: 1/80   ISO: 400   F-number: 3.5
Focal length: 37.5 mm   (35 mm equivalent)
Exposure compensation: 2

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.