Contrast ratio results

Black
Contrast ratio	212:1
Monitor model
Submitted	07 Nov 2009 22:03 CET, by 91.191..
Camera model	Pentax Optio 50L
Processing remarks	image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Screen photo	[open image]
Luminance	1.02 cd/m2
Luminance spread	1.52 cd/m2 (2 standard deviations)
Exposure value	–1.72 stops (aim for –2 to –3)
Exposure spread	2.78 stops
Area used for calculation	0.513 x 0.513
Camera settings	Exposure time: 1 ISO: 200 F-number: 2.8 Focal length: 35.5 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	216 cd/m2
Luminance spread	59 cd/m2 (2 standard deviations)
Exposure value	–2.26 stops (aim for –2 to –3)
Exposure spread	0.4 stops
Area used for calculation	0.513 x 0.513
Camera settings	Exposure time: 1/309 ISO: 200 F-number: 2.8 Focal length: 35.5 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.