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Contrast ratio of Apple Cinema Display 20 Inch. Serial Num

Contrast ratio 489:1
Monitor model Apple Cinema Display 20 Inch. Serial Num
Submitted 12 Oct 2015 01:39 CEST, by 69.62.*.*
Camera model Olympus E-5
Processing remarks


Black
Screen photo
[open image]
Luminance 0.33 cd/m2
Luminance spread 0.07 cd/m2 (2 standard deviations)
Exposure value –2.32 stops   (aim for –2 to –3)
Exposure spread 0.32 stops
Area used for calculation 0.347 x 0.347
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 24 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 164 cd/m2
Luminance spread 10 cd/m2 (2 standard deviations)
Exposure value –2.03 stops   (aim for –2 to –3)
Exposure spread 0.09 stops
Area used for calculation 0.347 x 0.347
Camera settings Exposure time: 1/400   ISO: 400   F-number: 2.8
Focal length: 24 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.