Contrast ratio results for Dell S2340m

Black
Contrast ratio	907:1 (edge: 435:1)
Monitor model	Dell S2340m
Submitted	25 Nov 2012 08:03 CET, by 209.215..
Camera model	Nikon D7000
Processing remarks	Warning: image file 3: Overexposed. Please decrease the shutter time. Note: image file 3: suggested exposure time: 4.0 s (Set EV to -0.7)
Screen photo	[open image]
Luminance	0.22 cd/m2
Luminance spread	0.06 cd/m2 (2 standard deviations)
Exposure value	–1.66 stops (aim for –2 to –3)
Exposure spread	0.37 stops
Area used for calculation	0.388 x 0.439
Camera settings	Exposure time: 15 ISO: 100 F-number: 3.5 Focal length: 28 mm (35 mm equivalent) Exposure compensation: -1
White
Screen photo	[open image]
Luminance	200 cd/m2
Luminance spread	40 cd/m2 (2 standard deviations)
Exposure value	–2.39 stops (aim for –2 to –3)
Exposure spread	0.29 stops
Area used for calculation	0.388 x 0.439
Camera settings	Exposure time: 1/100 ISO: 100 F-number: 3.5 Focal length: 28 mm (35 mm equivalent) Exposure compensation: -3
Black at screen edge
Screen photo	[open image]
Luminance	0.46 cd/m2
Luminance spread	0.57 cd/m2 (2 standard deviations)
Exposure value	–0.81 stops (aim for –2 to –3)
Exposure spread	2.1 stops
Area used for calculation	0.388 x 0.439
Camera settings	Exposure time: 13 ISO: 100 F-number: 3.5 Focal length: 28 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.