Contrast ratio results

Black
Contrast ratio	4623:1
Monitor model
Submitted	12 Jul 2013 12:25 CEST, by 79.114..
Camera model	Nikon D300
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 10.4 s (Set EV to +8.3) image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Note: image file 2: suggested exposure time: 1/440 s (Set EV to -1.8) image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 3: Overexposed. Please decrease the shutter time. Note: image file 3: suggested exposure time: 1/88 s (Set EV to -1.5) Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	0.03 cd/m2
Luminance spread	0.71 cd/m2 (2 standard deviations)
Exposure value	–10.79 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/30 ISO: 400 F-number: 2.8 Focal length: 75 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	131 cd/m2
Luminance spread	20 cd/m2 (2 standard deviations)
Exposure value	–0.67 stops (aim for –2 to –3)
Exposure spread	0.22 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/125 ISO: 400 F-number: 2.8 Focal length: 75 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	26 cd/m2
Luminance spread	50 cd/m2 (2 standard deviations)
Exposure value	–0.95 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/30 ISO: 400 F-number: 2.8 Focal length: 75 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.