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

Contrast ratio results

Contrast ratio 214:1
Monitor model
Submitted 08 Jan 2012 17:02 CET, by 76.108.*.*
Camera model Pentax K-5
Processing remarks


Black
Screen photo
[open image]
Luminance 0.34 cd/m2
Luminance spread 0.77 cd/m2 (2 standard deviations)
Exposure value –2.96 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.417 x 0.469
Camera settings Exposure time: 1.3   ISO: 400   F-number: 4
Focal length: 30 mm   (35 mm equivalent)
Exposure compensation: -1.7
White
Screen photo
[open image]
Luminance 72 cd/m2
Luminance spread 22 cd/m2 (2 standard deviations)
Exposure value –2.24 stops   (aim for –2 to –3)
Exposure spread 0.45 stops
Area used for calculation 0.417 x 0.469
Camera settings Exposure time: 1/100   ISO: 400   F-number: 4
Focal length: 30 mm   (35 mm equivalent)
Exposure compensation: -1.7

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.