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

Contrast ratio results

Contrast ratio 303:1
Monitor model
Submitted 10 Jul 2016 01:56 CEST, by 206.47.*.*
Camera model Canon EOS REBEL T4i
Processing remarks

Note: image file 1: suggested exposure time: 0.8 s (Set EV to -1.9)

Black
Screen photo
[open image]
Luminance 0.56 cd/m2
Luminance spread 0.09 cd/m2 (2 standard deviations)
Exposure value –0.55 stops   (aim for –2 to –3)
Exposure spread 0.23 stops
Area used for calculation 0.396 x 0.445
Camera settings Exposure time: 3.2   ISO: 400   F-number: 3.5
Focal length: 28.5 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 169 cd/m2
Luminance spread 30 cd/m2 (2 standard deviations)
Exposure value –2.61 stops   (aim for –2 to –3)
Exposure spread 0.25 stops
Area used for calculation 0.396 x 0.445
Camera settings Exposure time: 1/395   ISO: 400   F-number: 3.5
Focal length: 28.5 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.