Contrast ratio results

Contrast ratio 108:1
Monitor model
Submitted 08 Jan 2012 16:07 CET, by 76.108.*.*
Camera model Pentax K-5
Processing remarks

Note: image file 2: suggested exposure time: 1/89 s (Set EV to -1.8)
Warning: Image focal lengths/zoom levels are not the same.

Black
Screen photo
Luminance 0.5 cd/m2
Luminance spread 1.04 cd/m2 (2 standard deviations)
Exposure value –2.11 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.681 x 0.766
Camera settings Exposure time: 1.6   ISO: 400   F-number: 4
Focal length: 49 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 54 cd/m2
Luminance spread 8 cd/m2 (2 standard deviations)
Exposure value –0.67 stops   (aim for –2 to –3)
Exposure spread 0.23 stops
Area used for calculation 0.375 x 0.422
Camera settings Exposure time: 1/25   ISO: 400   F-number: 4
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.