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

Contrast ratio results

Contrast ratio 65:1
Monitor model
Submitted 13 Jul 2010 08:06 CEST, by 24.255.*.*
Camera model SAMSUNG VLUU ST5000 ST5000 TL240
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Note: image file 1: suggested exposure time: 15.0 s (Set EV to +1.4)
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/4 s (Set EV to +0.5)

Black
Screen photo
[open image]
Luminance 0.14 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –3.9 stops   (aim for –2 to –3)
Exposure spread 0.59 stops
Area used for calculation 0.448 x 0.448
Camera settings Exposure time: 5.7   ISO: 80   F-number: 3.3
Focal length: 31 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 9 cd/m2
Luminance spread 5 cd/m2 (2 standard deviations)
Exposure value –5.04 stops   (aim for –2 to –3)
Exposure spread 0.79 stops
Area used for calculation 0.448 x 0.448
Camera settings Exposure time: 1/25   ISO: 80   F-number: 3.3
Focal length: 31 mm   (35 mm equivalent)
Exposure compensation: -2

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.