Contrast ratio results

Black
Contrast ratio	2:1
Monitor model
Submitted	14 Oct 2010 11:35 CEST, by 58.137..
Camera model	Canon EOS 5D
Processing remarks	Warning: image file 1: camera was zoomed in too much. image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Note: image file 1: suggested exposure time: 1/22 s (Set EV to +1.4) Warning: image file 2: camera was zoomed in too much. image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: Image ISO settings are not the same. Warning: Image F-number settings are not the same. Warning: Image focal lengths/zoom levels are not the same.
Screen photo	[open image]
Luminance	4.33 cd/m2
Luminance spread	16.38 cd/m2 (2 standard deviations)
Exposure value	–3.92 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	1 x 0.5
Camera settings	Exposure time: 1/60 ISO: 1 F-number: 4 Focal length: 243 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	10 cd/m2
Luminance spread	23 cd/m2 (2 standard deviations)
Exposure value	–2.29 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/60 ISO: 640 F-number: 2.5 Focal length: 304 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.