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

Contrast ratio of Viewsonic vx2255wmb

Contrast ratio 797:1 (edge: 918:1)
Monitor model Viewsonic vx2255wmb
Submitted 09 Nov 2008 10:57 CET, by 212.123.*.*
Camera model Sony DSC-S90
Processing remarks


Black
Screen photo
[open image]
Luminance 0.34 cd/m2
Luminance spread 0.07 cd/m2 (2 standard deviations)
Exposure value –2.32 stops   (aim for –2 to –3)
Exposure spread 0.31 stops
Area used for calculation 0.558 x 0.558
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 38.6 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 267 cd/m2
Luminance spread 37 cd/m2 (2 standard deviations)
Exposure value –1.33 stops   (aim for –2 to –3)
Exposure spread 0.2 stops
Area used for calculation 0.558 x 0.558
Camera settings Exposure time: 1/400   ISO: 400   F-number: 2.8
Focal length: 38.6 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0.29 cd/m2
Luminance spread 0.08 cd/m2 (2 standard deviations)
Exposure value –2.52 stops   (aim for –2 to –3)
Exposure spread 0.39 stops
Area used for calculation 0.558 x 0.558
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 38.6 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.