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Contrast ratio of Conrac 6020AD

Contrast ratio 477:1
Monitor model Conrac 6020AD
Submitted 16 Jul 2008 09:37 CEST, by 193.163.*.*
Camera model Canon PowerShot S50
Processing remarks

Note: image file 1: suggested exposure time: 0.4 s (Set EV to -1.3)

Black
Screen photo
[open image]
Luminance 0.71 cd/m2
Luminance spread 0.08 cd/m2 (2 standard deviations)
Exposure value –1.23 stops   (aim for –2 to –3)
Exposure spread 0.16 stops
Area used for calculation 0.482 x 0.482
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 33.4 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 340 cd/m2
Luminance spread 23 cd/m2 (2 standard deviations)
Exposure value –0.99 stops   (aim for –2 to –3)
Exposure spread 0.1 stops
Area used for calculation 0.482 x 0.482
Camera settings Exposure time: 1/403   ISO: 400   F-number: 2.8
Focal length: 33.4 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.