Contrast ratio results

Contrast ratio 1489:1
Monitor model
Submitted 08 Mar 2011 20:04 CET, by 85.230.*.*
Camera model Pentax K200D
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 423.7 s (Set EV to +4.8)

Black
Screen photo
Luminance 0.07 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –7.32 stops   (aim for –2 to –3)
Exposure spread 0.23 stops
Area used for calculation 0.375 x 0.421
Camera settings Exposure time: 15   ISO: 200   F-number: 20
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 106 cd/m2
Luminance spread 7 cd/m2 (2 standard deviations)
Exposure value –2.69 stops   (aim for –2 to –3)
Exposure spread 0.1 stops
Area used for calculation 0.375 x 0.421
Camera settings Exposure time: 1/4   ISO: 200   F-number: 20
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.