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

Contrast ratio of HP LP2475W

Contrast ratio 775:1
Monitor model HP LP2475W
Submitted 14 Dec 2010 08:33 CET, by 96.20.*.*
Camera model Sony NEX-5
Processing remarks


Black
Screen photo
[open image]
Luminance 0.24 cd/m2
Luminance spread 0.08 cd/m2 (2 standard deviations)
Exposure value –2.41 stops   (aim for –2 to –3)
Exposure spread 0.5 stops
Area used for calculation 0.333 x 0.376
Camera settings Exposure time: 1.3   ISO: 400   F-number: 2.8
Focal length: 24 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 187 cd/m2
Luminance spread 23 cd/m2 (2 standard deviations)
Exposure value –1.52 stops   (aim for –2 to –3)
Exposure spread 0.18 stops
Area used for calculation 0.333 x 0.376
Camera settings Exposure time: 1/320   ISO: 400   F-number: 2.8
Focal length: 24 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.