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

Contrast ratio of Dell U2311 A02

Contrast ratio 705:1 (edge: 674:1)
Monitor model Dell U2311 A02
Submitted 29 Mar 2011 21:14 CEST, by 86.144.*.*
Camera model Olympus E-30
Processing remarks


Black
Screen photo
[open image]
Luminance 0.14 cd/m2
Luminance spread 0.03 cd/m2 (2 standard deviations)
Exposure value –2.94 stops   (aim for –2 to –3)
Exposure spread 0.36 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 2.5   ISO: 400   F-number: 3.5
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: -0.3
White
Screen photo
[open image]
Luminance 96 cd/m2
Luminance spread 19 cd/m2 (2 standard deviations)
Exposure value –2.76 stops   (aim for –2 to –3)
Exposure spread 0.29 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 1/250   ISO: 400   F-number: 3.5
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: -0.7
Black at screen edge
Screen photo
[open image]
Luminance 0.14 cd/m2
Luminance spread 0.03 cd/m2 (2 standard deviations)
Exposure value –3.19 stops   (aim for –2 to –3)
Exposure spread 0.34 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 2   ISO: 400   F-number: 3.5
Focal length: 28 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.