Contrast ratio of Acer AL1715

Contrast ratio 564:1
Monitor model Acer AL1715
Submitted 29 Aug 2009 02:16 CEST, by 80.99.*.*
Camera model Pentax Optio A40
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.

Black
Screen photo
Luminance 0.22 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –2.91 stops   (aim for –2 to –3)
Exposure spread 0.4 stops
Area used for calculation 0.549 x 0.549
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 38 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 126 cd/m2
Luminance spread 26 cd/m2 (2 standard deviations)
Exposure value –2.41 stops   (aim for –2 to –3)
Exposure spread 0.3 stops
Area used for calculation 0.549 x 0.549
Camera settings Exposure time: 1/400   ISO: 400   F-number: 2.8
Focal length: 38 mm   (35 mm equivalent)
Exposure compensation: 0
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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.