Contrast ratio results for Dell U2410f

Black
Contrast ratio	145131:1
Monitor model	Dell U2410f
Submitted	24 Feb 2010 04:56 CET, by 89.212..
Camera model	Canon EOS DIGITAL REBEL XSi
Processing remarks	Warning: image file 1: camera was zoomed out too much. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 191.9 s (Set EV to +16.2) Warning: image file 2: camera was zoomed out too much.
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–18.71 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.1 x 0.113
Camera settings	Exposure time: 1/395 ISO: 400 F-number: 3.5 Focal length: 0.6 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	350 cd/m2
Luminance spread	11 cd/m2 (2 standard deviations)
Exposure value	–1.56 stops (aim for –2 to –3)
Exposure spread	0.04 stops
Area used for calculation	0.1 x 0.113
Camera settings	Exposure time: 1/395 ISO: 400 F-number: 3.5 Focal length: 0.6 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.