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

Contrast ratio results

Contrast ratio 701:1
Monitor model
Submitted 14 May 2013 11:47 CEST, by 80.4.*.*
Camera model Canon EOS 400D DIGITAL
Processing remarks

Note: image file 1: suggested exposure time: 1.3 s (Set EV to +1.1)
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: Image F-number settings are not the same.

Black
Screen photo
[open image]
Luminance 0.18 cd/m2
Luminance spread 0.12 cd/m2 (2 standard deviations)
Exposure value –3.59 stops   (aim for –2 to –3)
Exposure spread 1.02 stops
Area used for calculation 0.455 x 0.513
Camera settings Exposure time: 0.6   ISO: 800   F-number: 3.5
Focal length: 32.8 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 127 cd/m2
Luminance spread 26 cd/m2 (2 standard deviations)
Exposure value –2.61 stops   (aim for –2 to –3)
Exposure spread 0.3 stops
Area used for calculation 0.455 x 0.513
Camera settings Exposure time: 1/15   ISO: 800   F-number: 22
Focal length: 32.8 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.