Contrast ratio results for HP2311x

Black
Contrast ratio	810:1
Monitor model	HP2311x
Submitted	19 Jul 2014 22:44 CEST, by 94.69..
Camera model	Sony ST25i
Processing remarks	Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 3.3 s (Set EV to +4.7) Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 3: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). 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 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	0.08 cd/m2
Luminance spread	0.06 cd/m2 (2 standard deviations)
Exposure value	–7.24 stops (aim for –2 to –3)
Exposure spread	1.3 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1/8 ISO: 400 F-number: 2.6 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	62 cd/m2
Luminance spread	13 cd/m2 (2 standard deviations)
Exposure value	–1.78 stops (aim for –2 to –3)
Exposure spread	0.3 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1/147 ISO: 400 F-number: 2.6 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	43 cd/m2
Luminance spread	83 cd/m2 (2 standard deviations)
Exposure value	–1.76 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1/100 ISO: 400 F-number: 2.6 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.