Contrast ratio results for BenQ GW2750HM

Black
Contrast ratio	2967:1
Monitor model	BenQ GW2750HM
Submitted	12 Mar 2013 15:40 CET, by 188.27..
Camera model	Nikon D40
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 5.8 s (Set EV to +1.5) Note: image file 2: suggested exposure time: 1/510 s (Set EV to -1.0)
Screen photo	[open image]
Luminance	0.05 cd/m2
Luminance spread	0.06 cd/m2 (2 standard deviations)
Exposure value	–4.03 stops (aim for –2 to –3)
Exposure spread	2.13 stops
Area used for calculation	0.375 x 0.423
Camera settings	Exposure time: 2 ISO: 1600 F-number: 5.6 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	152 cd/m2
Luminance spread	12 cd/m2 (2 standard deviations)
Exposure value	–1.46 stops (aim for –2 to –3)
Exposure spread	0.11 stops
Area used for calculation	0.375 x 0.423
Camera settings	Exposure time: 1/250 ISO: 1600 F-number: 5.6 Focal length: 27 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.