Contrast ratio of Dell S2240M

Contrast ratio 920:1
Monitor model Dell S2240M
Submitted 08 Jan 2015 03:30 CET, by 70.170.*.*
Camera model Canon EOS REBEL T3i
Processing remarks


Black
Screen photo
Luminance 0.13 cd/m2
Luminance spread 0.09 cd/m2 (2 standard deviations)
Exposure value –2.74 stops   (aim for –2 to –3)
Exposure spread 1.05 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 2   ISO: 400   F-number: 2.8
Focal length: 78.6 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 115 cd/m2
Luminance spread 107 cd/m2 (2 standard deviations)
Exposure value –2.52 stops   (aim for –2 to –3)
Exposure spread 1.45 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/395   ISO: 400   F-number: 2.8
Focal length: 78.6 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.