Contrast ratio results for Q270

Black
Contrast ratio	20528:1
Monitor model	Q270
Submitted	17 Apr 2014 04:40 CEST, by 208.107..
Camera model	Canon EOS REBEL T3i
Processing remarks	Warning: image file 1: camera was zoomed in too much. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 302.5 s (Set EV to +11.8) 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: 1/68 s (Set EV to -2.5)
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–14.33 stops (aim for –2 to –3)
Exposure spread	1.39 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/12 ISO: 200 F-number: 2 Focal length: 78.6 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	21 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–0 stops (aim for –2 to –3)
Exposure spread	0 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/12 ISO: 200 F-number: 2 Focal length: 78.6 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.