Contrast ratio results

Black
Contrast ratio	8716:1 (edge: 5931:1)
Monitor model
Submitted	25 Jan 2010 20:40 CET, by 78.53..
Camera model	Sony DSLR-A700
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 69.4 s (Set EV to +5.1) Warning: image file 3: Underexposed. Please increase the shutter time. Note: image file 3: suggested exposure time: 47.2 s (Set EV to +4.6)
Screen photo	[open image]
Luminance	0.01 cd/m2
Luminance spread	0.01 cd/m2 (2 standard deviations)
Exposure value	–8.62 stops (aim for –2 to –3)
Exposure spread	1.1 stops
Area used for calculation	0.459 x 0.514
Camera settings	Exposure time: 1 ISO: 400 F-number: 4.5 Focal length: 33 mm (35 mm equivalent) Exposure compensation: -1
White
Screen photo	[open image]
Luminance	96 cd/m2
Luminance spread	11 cd/m2 (2 standard deviations)
Exposure value	–2.17 stops (aim for –2 to –3)
Exposure spread	0.16 stops
Area used for calculation	0.459 x 0.514
Camera settings	Exposure time: 1/100 ISO: 400 F-number: 4.5 Focal length: 33 mm (35 mm equivalent) Exposure compensation: -1
Black at screen edge
Screen photo	[open image]
Luminance	0.02 cd/m2
Luminance spread	0.01 cd/m2 (2 standard deviations)
Exposure value	–8.06 stops (aim for –2 to –3)
Exposure spread	1.28 stops
Area used for calculation	0.459 x 0.514
Camera settings	Exposure time: 1 ISO: 400 F-number: 4.5 Focal length: 33 mm (35 mm equivalent) Exposure compensation: -1

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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.