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

Contrast ratio results for Viewsonic

Contrast ratio 622:1 (edge: 536:1)
Monitor model Viewsonic
Submitted 09 Oct 2017 05:32 CEST, by 172.127.*.*
Camera model Canon PowerShot SX150 IS
Processing remarks

Note: image file 1: suggested exposure time: 8.7 s (Set EV to +1.4)
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/72 s (Set EV to +2.5)
Note: image file 3: suggested exposure time: 7.5 s (Set EV to +1.2)

Black
Screen photo
[open image]
Luminance 0.1 cd/m2
Luminance spread 0.08 cd/m2 (2 standard deviations)
Exposure value –3.94 stops   (aim for –2 to –3)
Exposure spread 1.17 stops
Area used for calculation 0.406 x 0.406
Camera settings Exposure time: 3.2   ISO: 200   F-number: 3.4
Focal length: 28.1 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 63 cd/m2
Luminance spread 7 cd/m2 (2 standard deviations)
Exposure value –4.99 stops   (aim for –2 to –3)
Exposure spread 0.16 stops
Area used for calculation 0.406 x 0.406
Camera settings Exposure time: 1/403   ISO: 200   F-number: 3.4
Focal length: 28.1 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0.12 cd/m2
Luminance spread 0.09 cd/m2 (2 standard deviations)
Exposure value –3.73 stops   (aim for –2 to –3)
Exposure spread 1.21 stops
Area used for calculation 0.406 x 0.406
Camera settings Exposure time: 3.2   ISO: 200   F-number: 3.4
Focal length: 28.1 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.