Contrast ratio results

Black
Contrast ratio	492:1
Monitor model
Submitted	24 Jun 2008 16:05 CEST, by 82.76..
Camera model	Nikon D80
Processing remarks	Note: image file 1: suggested exposure time: 2.1 s (Set EV to +6.5) Note: image file 2: suggested exposure time: 1/180 s (Set EV to -0.6) Warning: Image F-number settings are not the same.
Screen photo	[open image]
Luminance	0.22 cd/m2
Luminance spread	0.02 cd/m2 (2 standard deviations)
Exposure value	–1.01 stops (aim for –2 to –3)
Exposure spread	0.16 stops
Area used for calculation	0.375 x 0.421
Camera settings	Exposure time: 6 ISO: 400 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 8
White
Screen photo	[open image]
Luminance	107 cd/m2
Luminance spread	10 cd/m2 (2 standard deviations)
Exposure value	–0.94 stops (aim for –2 to –3)
Exposure spread	0.14 stops
Area used for calculation	0.375 x 0.421
Camera settings	Exposure time: 1/60 ISO: 400 F-number: 4 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 1

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.