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

Contrast ratio results for Viewsonic

Contrast ratio 1843:1
Monitor model Viewsonic
Submitted 09 Oct 2017 03:43 CEST, by 172.127.*.*
Camera model Canon PowerShot SX150 IS
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 8.4 s (Set EV to +3.1)

Black
Screen photo
[open image]
Luminance 0.05 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –5.58 stops   (aim for –2 to –3)
Exposure spread 1.73 stops
Area used for calculation 0.406 x 0.406
Camera settings Exposure time: 1   ISO: 400   F-number: 3.4
Focal length: 28.1 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 95 cd/m2
Luminance spread 8 cd/m2 (2 standard deviations)
Exposure value –2.7 stops   (aim for –2 to –3)
Exposure spread 0.11 stops
Area used for calculation 0.406 x 0.406
Camera settings Exposure time: 1/251   ISO: 400   F-number: 3.4
Focal length: 28.1 mm   (35 mm equivalent)
Exposure compensation: 0
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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.