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

Contrast ratio of Dell Latitude E5540 / AUO21ED Panel

Contrast ratio 623:1
Monitor model Dell Latitude E5540 / AUO21ED Panel
Submitted 03 Jun 2015 00:37 CEST, by 5.45.*.*
Camera model Canon PowerShot A650 IS
Processing remarks


Black
Screen photo
[open image]
Luminance 0.53 cd/m2
Luminance spread 0.13 cd/m2 (2 standard deviations)
Exposure value –1.67 stops   (aim for –2 to –3)
Exposure spread 0.37 stops
Area used for calculation 0.488 x 0.488
Camera settings Exposure time: 4   ISO: 100   F-number: 2.8
Focal length: 33.8 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 329 cd/m2
Luminance spread 45 cd/m2 (2 standard deviations)
Exposure value –2.04 stops   (aim for –2 to –3)
Exposure spread 0.2 stops
Area used for calculation 0.488 x 0.488
Camera settings Exposure time: 1/202   ISO: 100   F-number: 2.8
Focal length: 33.8 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.