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

Contrast ratio results

Contrast ratio 5720:1
Monitor model
Submitted 09 Dec 2022 19:48 CET, by 195.58.*.*
Camera model Canon EOS 550D
Processing remarks

Note: image file 1: suggested exposure time: 1.3 s (Set EV to -0.8)
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.

Black
Screen photo
[open image]
Luminance 0.09 cd/m2
Luminance spread 0.07 cd/m2 (2 standard deviations)
Exposure value –3.66 stops   (aim for –2 to –3)
Exposure spread 1.16 stops
Area used for calculation 0.611 x 0.687
Camera settings Exposure time: 0.6   ISO: 400   F-number: 1.8
Focal length: 44 mm   (35 mm equivalent)
Exposure compensation: -2
White
Screen photo
[open image]
Luminance 522 cd/m2
Luminance spread 204 cd/m2 (2 standard deviations)
Exposure value –2.07 stops   (aim for –2 to –3)
Exposure spread 0.57 stops
Area used for calculation 0.611 x 0.687
Camera settings Exposure time: 1/3158   ISO: 400   F-number: 1.8
Focal length: 44 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.