Contrast ratio | Test results | LCD test | Small-screen tests | Lagom home

Contrast ratio of M247

Contrast ratio 940:1 (edge: 918:1)
Monitor model M247
Submitted 21 Oct 2008 15:08 CEST, by 222.191.*.*
Camera model Panasonic DMC-LX2
Processing remarks


Black
Screen photo
[open image]
Luminance 0.46 cd/m2
Luminance spread 0.21 cd/m2 (2 standard deviations)
Exposure value –2.87 stops   (aim for –2 to –3)
Exposure spread 0.66 stops
Area used for calculation 0.491 x 0.491
Camera settings Exposure time: 0.5   ISO: 400   F-number: 2.8
Focal length: 34 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 430 cd/m2
Luminance spread 29 cd/m2 (2 standard deviations)
Exposure value –0.64 stops   (aim for –2 to –3)
Exposure spread 0.1 stops
Area used for calculation 0.491 x 0.491
Camera settings Exposure time: 1/400   ISO: 400   F-number: 2.8
Focal length: 34 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0.47 cd/m2
Luminance spread 0.28 cd/m2 (2 standard deviations)
Exposure value –2.84 stops   (aim for –2 to –3)
Exposure spread 0.87 stops
Area used for calculation 0.491 x 0.491
Camera settings Exposure time: 0.5   ISO: 400   F-number: 2.8
Focal length: 34 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.