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

Contrast ratio results

Contrast ratio 1813:1
Monitor model
Submitted 29 May 2016 12:32 CEST, by 139.192.*.*
Camera model Canon PowerShot SX270 HS
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 27.7 s (Set EV to +8.5)
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/65 s (Set EV to -2.3)

Black
Screen photo
[open image]
Luminance 0.08 cd/m2
Luminance spread 0.09 cd/m2 (2 standard deviations)
Exposure value –10.99 stops   (aim for –2 to –3)
Exposure spread 1.83 stops
Area used for calculation 0.365 x 0.358
Camera settings Exposure time: 1/13   ISO: 80   F-number: 3.5
Focal length: 25.1 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 152 cd/m2
Luminance spread 16 cd/m2 (2 standard deviations)
Exposure value –0.17 stops   (aim for –2 to –3)
Exposure spread 0.15 stops
Area used for calculation 0.362 x 0.363
Camera settings Exposure time: 1/13   ISO: 80   F-number: 3.5
Focal length: 25.1 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.