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

Contrast ratio results for Apple M8893ZM/A

Contrast ratio 1:1
Monitor model Apple M8893ZM/A
Submitted 19 Jul 2012 03:56 CEST, by 189.79.*.*
Camera model Canon PowerShot SX230 HS
Processing remarks

Warning: image file 1: camera was zoomed in too much.
Warning: image file 2: camera was zoomed in too much.

Black
Screen photo
[open image]
Luminance 195 cd/m2
Luminance spread 63 cd/m2 (2 standard deviations)
Exposure value –2.94 stops   (aim for –2 to –3)
Exposure spread 0.47 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/202   ISO: 400   F-number: 5.9
Focal length: 391 mm   (35 mm equivalent)
Exposure compensation: -2
White
Screen photo
[open image]
Luminance 196 cd/m2
Luminance spread 62 cd/m2 (2 standard deviations)
Exposure value –2.94 stops   (aim for –2 to –3)
Exposure spread 0.46 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/202   ISO: 400   F-number: 5.9
Focal length: 391 mm   (35 mm equivalent)
Exposure compensation: -2

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.