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Contrast ratio results for BENQ GW2450HM

Contrast ratio 1971:1 (edge: 3118:1)
Monitor model BENQ GW2450HM
Submitted 13 Jun 2012 20:49 CEST, by 31.185.*.*
Camera model Nikon COOLPIX P50
Processing remarks

Note: image file 2: suggested exposure time: 1/510 s (Set EV to -1.0)
image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 4.7 s (Set EV to +3.2)
Warning: Image ISO settings are not the same.
Warning: Image F-number settings are not the same.
Warning: Image focal lengths/zoom levels are not the same.

Black
Screen photo
[open image]
Luminance 0.15 cd/m2
Luminance spread 0.13 cd/m2 (2 standard deviations)
Exposure value –2.44 stops   (aim for –2 to –3)
Exposure spread 1.25 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 4   ISO: 200   F-number: 2.8
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 305 cd/m2
Luminance spread 43 cd/m2 (2 standard deviations)
Exposure value –1.46 stops   (aim for –2 to –3)
Exposure spread 0.2 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 1/250   ISO: 200   F-number: 2.8
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0.1 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –5.74 stops   (aim for –2 to –3)
Exposure spread 0.64 stops
Area used for calculation 0.65 x 0.65
Camera settings Exposure time: 0.5   ISO: 400   F-number: 3.5
Focal length: 45 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.