Contrast ratio results for Dell 2405FPW

Black
Contrast ratio	4085:1
Monitor model	Dell 2405FPW
Submitted	29 Dec 2008 16:43 CET, by 85.195..
Camera model	Pentax Optio S5i
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 15.5 s (Set EV to +8.0) image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Screen photo	[open image]
Luminance	0.03 cd/m2
Luminance spread	0.03 cd/m2 (2 standard deviations)
Exposure value	–8.46 stops (aim for –2 to –3)
Exposure spread	1.85 stops
Area used for calculation	0.896 x 0.896
Camera settings	Exposure time: 1/4 ISO: 400 F-number: 3.5 Focal length: 62 mm (35 mm equivalent) Exposure compensation: 2
White
Screen photo	[open image]
Luminance	122 cd/m2
Luminance spread	32 cd/m2 (2 standard deviations)
Exposure value	–2.1 stops (aim for –2 to –3)
Exposure spread	0.38 stops
Area used for calculation	0.896 x 0.896
Camera settings	Exposure time: 1/200 ISO: 400 F-number: 3.5 Focal length: 62 mm (35 mm equivalent) Exposure compensation: 0.7

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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.