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

Contrast ratio results

Contrast ratio 4:1
Monitor model
Submitted 19 Oct 2016 05:13 CEST, by 75.158.*.*
Camera model Canon EOS 40D
Processing remarks


Black
Screen photo
[open image]
Luminance 12 cd/m2
Luminance spread 12 cd/m2 (2 standard deviations)
Exposure value –2.82 stops   (aim for –2 to –3)
Exposure spread 1.61 stops
Area used for calculation 0.382 x 0.43
Camera settings Exposure time: 1/25   ISO: 400   F-number: 4
Focal length: 27.5 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 48 cd/m2
Luminance spread 29 cd/m2 (2 standard deviations)
Exposure value –2.83 stops   (aim for –2 to –3)
Exposure spread 0.91 stops
Area used for calculation 0.382 x 0.43
Camera settings Exposure time: 1/99   ISO: 400   F-number: 4
Focal length: 27.5 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.