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

Contrast ratio results

Contrast ratio 208:1
Monitor model
Submitted 14 Jul 2011 20:15 CEST, by 67.164.*.*
Camera model Canon EOS DIGITAL REBEL XSi
Processing remarks

Note: image file 2: suggested exposure time: 1/100 s (Set EV to -1.0)

Black
Screen photo
[open image]
Luminance 0.74 cd/m2
Luminance spread 0.03 cd/m2 (2 standard deviations)
Exposure value –1.56 stops   (aim for –2 to –3)
Exposure spread 0.06 stops
Area used for calculation 0.133 x 0.15
Camera settings Exposure time: 4   ISO: 400   F-number: 6.4
Focal length: 9.6 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 155 cd/m2
Luminance spread 3 cd/m2 (2 standard deviations)
Exposure value –1.47 stops   (aim for –2 to –3)
Exposure spread 0.02 stops
Area used for calculation 0.133 x 0.15
Camera settings Exposure time: 1/49   ISO: 400   F-number: 6.4
Focal length: 9.6 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.