Contrast ratio results for Viewsonic VA243wm

Black
Contrast ratio	1868:1
Monitor model	Viewsonic VA243wm
Submitted	28 Aug 2012 05:22 CEST, by 71.20..
Camera model	Pentax K-5
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 10.5 s (Set EV to +3.4) Note: image file 2: suggested exposure time: 1/180 s (Set EV to +1.2)
Screen photo	[open image]
Luminance	0.04 cd/m2
Luminance spread	0.01 cd/m2 (2 standard deviations)
Exposure value	–5.89 stops (aim for –2 to –3)
Exposure spread	0.4 stops
Area used for calculation	0.375 x 0.422
Camera settings	Exposure time: 1 ISO: 400 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	83 cd/m2
Luminance spread	22 cd/m2 (2 standard deviations)
Exposure value	–3.66 stops (aim for –2 to –3)
Exposure spread	0.39 stops
Area used for calculation	0.375 x 0.422
Camera settings	Exposure time: 1/400 ISO: 400 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0

{adcode}

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.