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Contrast ratio results for dell u2412m

Contrast ratio 5550:1
Monitor model dell u2412m
Submitted 26 Nov 2012 14:20 CET, by 37.147.*.*
Camera model Sony SLT-A55V
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 88.4 s (Set EV to +10.4)
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/63 s (Set EV to -2.1)
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: 1/33 s (Set EV to -1.1)
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
[open image]
Luminance 0.01 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –12.87 stops   (aim for –2 to –3)
Exposure spread 0.81 stops
Area used for calculation 0.374 x 0.423
Camera settings Exposure time: 1/15   ISO: 800   F-number: 5.6
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 37 cd/m2
Luminance spread 2 cd/m2 (2 standard deviations)
Exposure value –0.43 stops   (aim for –2 to –3)
Exposure spread 0.09 stops
Area used for calculation 0.374 x 0.423
Camera settings Exposure time: 1/15   ISO: 800   F-number: 5.6
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 19 cd/m2
Luminance spread 38 cd/m2 (2 standard deviations)
Exposure value –1.38 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.374 x 0.423
Camera settings Exposure time: 1/15   ISO: 800   F-number: 5.6
Focal length: 27 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.