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

Contrast ratio results

Contrast ratio 701:1
Monitor model
Submitted 21 Sep 2009 19:56 CEST, by 95.102.*.*
Camera model Panasonic DMC-LZ5
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Note: image file 1: suggested exposure time: 2.6 s (Set EV to +1.4)
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Note: image file 2: suggested exposure time: 1/270 s (Set EV to -1.1)

Black
Screen photo
[open image]
Luminance 0.11 cd/m2
Luminance spread 0.05 cd/m2 (2 standard deviations)
Exposure value –3.87 stops   (aim for –2 to –3)
Exposure spread 0.58 stops
Area used for calculation 0.534 x 0.534
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 37 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 80 cd/m2
Luminance spread 34 cd/m2 (2 standard deviations)
Exposure value –1.39 stops   (aim for –2 to –3)
Exposure spread 0.63 stops
Area used for calculation 0.534 x 0.534
Camera settings Exposure time: 1/125   ISO: 400   F-number: 2.8
Focal length: 37 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.