Contrast ratio of Acer P241w

Contrast ratio 663:1
Monitor model Acer P241w
Submitted 05 Nov 2008 17:47 CET, by 68.53.*.*
Camera model Canon EOS 40D
Processing remarks


Black
Screen photo
Luminance 0.33 cd/m2
Luminance spread 0.09 cd/m2 (2 standard deviations)
Exposure value –2.36 stops   (aim for –2 to –3)
Exposure spread 0.41 stops
Area used for calculation 0.54 x 0.608
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 38.9 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 216 cd/m2
Luminance spread 64 cd/m2 (2 standard deviations)
Exposure value –1.63 stops   (aim for –2 to –3)
Exposure spread 0.43 stops
Area used for calculation 0.54 x 0.608
Camera settings Exposure time: 1/400   ISO: 400   F-number: 2.8
Focal length: 38.9 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.