Contrast ratio results

Black
Contrast ratio	161:1
Monitor model
Submitted	06 Dec 2014 16:26 CET, by 83.26..
Camera model	Sony DSLR-A700
Processing remarks	Warning: image file 1: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 2: Underexposed. Please increase the shutter time. Note: image file 2: suggested exposure time: 1/7 s (Set EV to +2.7) Warning: Image F-number settings are not the same.
Screen photo	[open image]
Luminance	58 cd/m2
Luminance spread	160 cd/m2 (2 standard deviations)
Exposure value	–5.87 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.875 x 0.438
Camera settings	Exposure time: 1/80 ISO: 200 F-number: 10 Focal length: 42 mm (35 mm equivalent) Exposure compensation: -0.7
White
Screen photo	[open image]
Luminance	9398 cd/m2
Luminance spread	11777 cd/m2 (2 standard deviations)
Exposure value	–2.46 stops (aim for –2 to –3)
Exposure spread	2.12 stops
Area used for calculation	0.917 x 0.429
Camera settings	Exposure time: 1/1000 ISO: 200 F-number: 11 Focal length: 42 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.