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Contrast ratio results for l1915s

Contrast ratio 258:1
Monitor model l1915s
Submitted 17 Mar 2011 22:06 CET, by 109.182.*.*
Camera model Canon EOS 400D DIGITAL
Processing remarks

image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Note: image file 3: suggested exposure time: 1/53 s (Set EV to +0.9)
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
[open image]
Luminance 0.31 cd/m2
Luminance spread 0.05 cd/m2 (2 standard deviations)
Exposure value –2.38 stops   (aim for –2 to –3)
Exposure spread 0.24 stops
Area used for calculation 0.39 x 0.44
Camera settings Exposure time: 1.6   ISO: 400   F-number: 3.5
Focal length: 28.1 mm   (35 mm equivalent)
Exposure compensation: 1
White
Screen photo
[open image]
Luminance 81 cd/m2
Luminance spread 27 cd/m2 (2 standard deviations)
Exposure value –1.69 stops   (aim for –2 to –3)
Exposure spread 0.49 stops
Area used for calculation 0.39 x 0.44
Camera settings Exposure time: 1/100   ISO: 400   F-number: 3.5
Focal length: 28.1 mm   (35 mm equivalent)
Exposure compensation: 2
Black at screen edge
Screen photo
[open image]
Luminance 25 cd/m2
Luminance spread 51 cd/m2 (2 standard deviations)
Exposure value –1.4 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.39 x 0.44
Camera settings Exposure time: 1/25   ISO: 400   F-number: 3.5
Focal length: 28.1 mm   (35 mm equivalent)
Exposure compensation: 2

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.