Contrast ratio results for Sony

Black
Contrast ratio	2315:1
Monitor model	Sony
Submitted	28 Aug 2013 08:03 CEST, by 24.84..
Camera model	Nikon D90
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 13.5 s (Set EV to +8.1) Warning: image file 2: camera was zoomed in too much. Warning: image file 2: Overexposed. Please decrease the shutter time. Note: image file 2: suggested exposure time: 1/88 s (Set EV to -2.1) Warning: Image F-number settings are not the same. Warning: Image focal lengths/zoom levels are not the same.
Screen photo	[open image]
Luminance	0.04 cd/m2
Luminance spread	0.03 cd/m2 (2 standard deviations)
Exposure value	–10.58 stops (aim for –2 to –3)
Exposure spread	0.96 stops
Area used for calculation	0.499 x 0.564
Camera settings	Exposure time: 1/20 ISO: 400 F-number: 3.8 Focal length: 36 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	93 cd/m2
Luminance spread	38 cd/m2 (2 standard deviations)
Exposure value	–0.36 stops (aim for –2 to –3)
Exposure spread	0.59 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/20 ISO: 400 F-number: 5.3 Focal length: 99 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.