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

Contrast ratio results

Contrast ratio 7123:1
Monitor model
Submitted 28 Oct 2016 13:42 CEST, by 220.249.*.*
Camera model Canon EOS 70D
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 223.2 s (Set EV to +10.1)
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/32 s (Set EV to +3.0)

Black
Screen photo
[open image]
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –12.62 stops   (aim for –2 to –3)
Exposure spread 0.88 stops
Area used for calculation 0.394 x 0.444
Camera settings Exposure time: 1/5   ISO: 400   F-number: 3.5
Focal length: 28.4 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 15 cd/m2
Luminance spread 4 cd/m2 (2 standard deviations)
Exposure value –5.5 stops   (aim for –2 to –3)
Exposure spread 0.43 stops
Area used for calculation 0.394 x 0.444
Camera settings Exposure time: 1/256   ISO: 400   F-number: 3.5
Focal length: 28.4 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.