Contrast ratio results for Dell U2410

Black
Contrast ratio	917:1 (edge: 1183:1)
Monitor model	Dell U2410
Submitted	24 Nov 2012 16:57 CET, by 188.221..
Camera model	Canon EOS 7D
Processing remarks	Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Screen photo	[open image]
Luminance	0.25 cd/m2
Luminance spread	0.05 cd/m2 (2 standard deviations)
Exposure value	–2.77 stops (aim for –2 to –3)
Exposure spread	0.31 stops
Area used for calculation	0.371 x 0.417
Camera settings	Exposure time: 1 ISO: 400 F-number: 2.8 Focal length: 26.7 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	226 cd/m2
Luminance spread	54 cd/m2 (2 standard deviations)
Exposure value	–2.3 stops (aim for –2 to –3)
Exposure spread	0.35 stops
Area used for calculation	0.371 x 0.417
Camera settings	Exposure time: 1/664 ISO: 400 F-number: 2.8 Focal length: 26.7 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	0.19 cd/m2
Luminance spread	0.03 cd/m2 (2 standard deviations)
Exposure value	–2.76 stops (aim for –2 to –3)
Exposure spread	0.25 stops
Area used for calculation	0.371 x 0.417
Camera settings	Exposure time: 1.3 ISO: 400 F-number: 2.8 Focal length: 26.7 mm (35 mm equivalent) Exposure compensation: 0

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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.