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

Contrast ratio of Apple 15" LED Backlit MacBook Pro 3,1

Contrast ratio 689:1
Monitor model Apple 15" LED Backlit MacBook Pro 3,1
Submitted 11 Oct 2008 14:41 CEST, by 86.134.*.*
Camera model Canon PowerShot A570 IS
Processing remarks


Black
Screen photo
[open image]
Luminance 0.44 cd/m2
Luminance spread 0.18 cd/m2 (2 standard deviations)
Exposure value –1.71 stops   (aim for –2 to –3)
Exposure spread 0.61 stops
Area used for calculation 0.495 x 0.495
Camera settings Exposure time: 1   ISO: 400   F-number: 2.6
Focal length: 34.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 304 cd/m2
Luminance spread 81 cd/m2 (2 standard deviations)
Exposure value –0.94 stops   (aim for –2 to –3)
Exposure spread 0.39 stops
Area used for calculation 0.495 x 0.495
Camera settings Exposure time: 1/403   ISO: 400   F-number: 2.6
Focal length: 34.3 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.