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Contrast ratio results for Dell U2311H

Contrast ratio 555:1
Monitor model Dell U2311H
Submitted 13 Aug 2010 07:08 CEST, by 99.108.*.*
Camera model Canon EOS DIGITAL REBEL XT
Processing remarks

Warning: image file 1: camera was zoomed in too much.
Warning: image file 2: camera was zoomed in too much.
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.

Black
Screen photo
[open image]
Luminance 0.23 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –1.87 stops   (aim for –2 to –3)
Exposure spread 0.24 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 0.5   ISO: 1   F-number: 2.8
Focal length: 156 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 127 cd/m2
Luminance spread 36 cd/m2 (2 standard deviations)
Exposure value –2.05 stops   (aim for –2 to –3)
Exposure spread 0.42 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/1250   ISO: 1   F-number: 2.8
Focal length: 156 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.