Contrast ratio results for ho probook

Black
Contrast ratio	156:1
Monitor model	ho probook
Submitted	03 Jun 2014 02:33 CEST, by 41.130..
Camera model	Nikon D7100
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 0.3 s (Set EV to +1.7) Note: image file 2: suggested exposure time: 1/470 s (Set EV to -5.5)
Screen photo	[open image]
Luminance	1.41 cd/m2
Luminance spread	2.17 cd/m2 (2 standard deviations)
Exposure value	–8.24 stops (aim for –2 to –3)
Exposure spread	2.93 stops
Area used for calculation	0.375 x 0.421
Camera settings	Exposure time: 1/160 ISO: 800 F-number: 5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: -4
White
Screen photo	[open image]
Luminance	221 cd/m2
Luminance spread	22 cd/m2 (2 standard deviations)
Exposure value	–0.95 stops (aim for –2 to –3)
Exposure spread	0.15 stops
Area used for calculation	0.375 x 0.421
Camera settings	Exposure time: 1/160 ISO: 800 F-number: 5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: -4

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.