Contrast ratio results

Black
Contrast ratio	1282:1
Monitor model
Submitted	20 Jun 2014 00:12 CEST, by 46.217..
Camera model	Nokia Lumia 625
Processing remarks	Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Note: image file 1: suggested exposure time: 2.6 s (Set EV to +1.4) Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Screen photo	[open image]
Luminance	0.08 cd/m2
Luminance spread	0.09 cd/m2 (2 standard deviations)
Exposure value	–3.86 stops (aim for –2 to –3)
Exposure spread	1.78 stops
Area used for calculation	0.528 x 0.705
Camera settings	Exposure time: 1 ISO: 400 F-number: 2.4 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	109 cd/m2
Luminance spread	26 cd/m2 (2 standard deviations)
Exposure value	–2.18 stops (aim for –2 to –3)
Exposure spread	0.34 stops
Area used for calculation	0.528 x 0.705
Camera settings	Exposure time: 1/400 ISO: 400 F-number: 2.4 Focal length: 0 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.