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

Contrast ratio results

Contrast ratio 25798:1
Monitor model
Submitted 26 Nov 2009 22:56 CET, by 89.38.*.*
Camera model Panasonic DMC-LZ2
Processing remarks

Warning: image file 1: camera was zoomed in too much.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 1257.5 s (Set EV to +13.3)
Warning: image file 2: camera was zoomed in too much.

Black
Screen photo
[open image]
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –15.8 stops   (aim for –2 to –3)
Exposure spread 2.65 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/8   ISO: 100   F-number: 4.4
Focal length: 197 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 60 cd/m2
Luminance spread 13 cd/m2 (2 standard deviations)
Exposure value –2.05 stops   (aim for –2 to –3)
Exposure spread 0.31 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/15   ISO: 100   F-number: 4.4
Focal length: 197 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.