Contrast ratio of Acer AL2623W

Contrast ratio 585:1
Monitor model Acer AL2623W
Submitted 17 Jan 2009 17:06 CET, by 195.240.*.*
Camera model Canon PowerShot S80
Processing remarks


Black
Screen photo
Luminance 0.4 cd/m2
Luminance spread 0.11 cd/m2 (2 standard deviations)
Exposure value –2.77 stops   (aim for –2 to –3)
Exposure spread 0.39 stops
Area used for calculation 0.488 x 0.488
Camera settings Exposure time: 1.6   ISO: 200   F-number: 3.2
Focal length: 33.8 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 235 cd/m2
Luminance spread 28 cd/m2 (2 standard deviations)
Exposure value –2.57 stops   (aim for –2 to –3)
Exposure spread 0.17 stops
Area used for calculation 0.488 x 0.488
Camera settings Exposure time: 1/318   ISO: 200   F-number: 3.2
Focal length: 33.8 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.