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

Contrast ratio results for BenQ EW2740L

Contrast ratio 1164:1
Monitor model BenQ EW2740L
Submitted 26 Nov 2013 22:56 CET, by 114.42.*.*
Camera model Canon PowerShot G7
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 9.2 s (Set EV to +3.2)

Black
Screen photo
[open image]
Luminance 0.03 cd/m2
Luminance spread 0.03 cd/m2 (2 standard deviations)
Exposure value –5.7 stops   (aim for –2 to –3)
Exposure spread 1.5 stops
Area used for calculation 0.495 x 0.495
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 34.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 38 cd/m2
Luminance spread 3 cd/m2 (2 standard deviations)
Exposure value –1.82 stops   (aim for –2 to –3)
Exposure spread 0.1 stops
Area used for calculation 0.495 x 0.495
Camera settings Exposure time: 1/79   ISO: 400   F-number: 2.8
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.