Contrast ratio results for ipad 3 retina new

Black
Contrast ratio	5:1
Monitor model	ipad 3 retina new
Submitted	06 Dec 2012 13:43 CET, by 77.239..
Camera model	Canon EOS 5D Mark II
Processing remarks	Warning: image file 1: camera was zoomed in too much. Warning: image file 1: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. Warning: image file 2: camera was zoomed in too much. Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Screen photo	[open image]
Luminance	61 cd/m2
Luminance spread	47 cd/m2 (2 standard deviations)
Exposure value	–3.45 stops (aim for –2 to –3)
Exposure spread	1.19 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/790 ISO: 200 F-number: 1.4 Focal length: 195 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	327 cd/m2
Luminance spread	259 cd/m2 (2 standard deviations)
Exposure value	–3.02 stops (aim for –2 to –3)
Exposure spread	1.21 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/3158 ISO: 200 F-number: 1.4 Focal length: 195 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.