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

Contrast ratio results for BenQ XL2420T

Contrast ratio 973:1
Monitor model BenQ XL2420T
Submitted 08 Nov 2012 14:55 CET, by 91.152.*.*
Camera model Canon PowerShot SX20 IS
Processing remarks

Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.

Black
Screen photo
[open image]
Luminance 0.26 cd/m2
Luminance spread 0.1 cd/m2 (2 standard deviations)
Exposure value –3.4 stops   (aim for –2 to –3)
Exposure spread 0.54 stops
Area used for calculation 0.394 x 0.394
Camera settings Exposure time: 0.6   ISO: 400   F-number: 2.8
Focal length: 27.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 257 cd/m2
Luminance spread 28 cd/m2 (2 standard deviations)
Exposure value –2.05 stops   (aim for –2 to –3)
Exposure spread 0.15 stops
Area used for calculation 0.394 x 0.394
Camera settings Exposure time: 1/636   ISO: 400   F-number: 2.8
Focal length: 27.3 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.