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

Contrast ratio results

Contrast ratio 1282:1
Monitor model
Submitted 25 Sep 2011 23:47 CEST, by 91.157.*.*
Camera model Canon EOS 550D
Processing remarks

Warning: image file 1: camera was zoomed out too much.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 13.1 s (Set EV to +0.7)
Warning: image file 2: camera was zoomed out too much.

Black
Screen photo
[open image]
Luminance 0.09 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –4.22 stops   (aim for –2 to –3)
Exposure spread 0.07 stops
Area used for calculation 0.1 x 0.113
Camera settings Exposure time: 4   ISO: 100   F-number: 2.8
Focal length: 1.5 mm   (35 mm equivalent)
Exposure compensation: -1
White
Screen photo
[open image]
Luminance 116 cd/m2
Luminance spread 3 cd/m2 (2 standard deviations)
Exposure value –3.27 stops   (aim for –2 to –3)
Exposure spread 0.03 stops
Area used for calculation 0.1 x 0.113
Camera settings Exposure time: 1/166   ISO: 100   F-number: 2.8
Focal length: 1.5 mm   (35 mm equivalent)
Exposure compensation: -1

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.