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

Contrast ratio results

Contrast ratio 2812:1
Monitor model
Submitted 06 Feb 2017 01:16 CET, by 89.16.*.*
Camera model Canon PowerShot SX200 IS
Processing remarks

Note: image file 1: suggested exposure time: 4.7 s (Set EV to +1.2)
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.

Black
Screen photo
[open image]
Luminance 0.05 cd/m2
Luminance spread 0.03 cd/m2 (2 standard deviations)
Exposure value –3.73 stops   (aim for –2 to –3)
Exposure spread 1.08 stops
Area used for calculation 0.394 x 0.394
Camera settings Exposure time: 2   ISO: 800   F-number: 3.4
Focal length: 27.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 131 cd/m2
Luminance spread 18 cd/m2 (2 standard deviations)
Exposure value –2.93 stops   (aim for –2 to –3)
Exposure spread 0.2 stops
Area used for calculation 0.394 x 0.394
Camera settings Exposure time: 1/807   ISO: 800   F-number: 3.4
Focal length: 27.3 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.