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

Contrast ratio results

Contrast ratio 176:1
Monitor model
Submitted 09 May 2010 23:14 CEST, by 87.61.*.*
Camera model Pentax K20D
Processing remarks

Note: image file 2: suggested exposure time: 1/74 s (Set EV to +0.4)

Black
Screen photo
[open image]
Luminance 0.12 cd/m2
Luminance spread 0.18 cd/m2 (2 standard deviations)
Exposure value –2.17 stops   (aim for –2 to –3)
Exposure spread 2.55 stops
Area used for calculation 0.347 x 0.39
Camera settings Exposure time: 3   ISO: 400   F-number: 2.8
Focal length: 25 mm   (35 mm equivalent)
Exposure compensation: 2
White
Screen photo
[open image]
Luminance 22 cd/m2
Luminance spread 11 cd/m2 (2 standard deviations)
Exposure value –0.94 stops   (aim for –2 to –3)
Exposure spread 0.76 stops
Area used for calculation 0.347 x 0.39
Camera settings Exposure time: 1/25   ISO: 400   F-number: 2.8
Focal length: 25 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.