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

Contrast ratio results for AOC LM 725

Contrast ratio 498:1 (edge: 558:1)
Monitor model AOC LM 725
Submitted 28 Aug 2010 12:51 CEST, by 80.31.*.*
Camera model Canon EOS 550D
Processing remarks

Warning: image file 1: camera was zoomed out too much.
Warning: image file 2: camera was zoomed out too much.
Warning: image file 3: camera was zoomed out too much.
image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Note: image file 3: suggested exposure time: 1.0 s (Set EV to +1.1)

Black
Screen photo
[open image]
Luminance 0.5 cd/m2
Luminance spread 0.08 cd/m2 (2 standard deviations)
Exposure value –3.13 stops   (aim for –2 to –3)
Exposure spread 0.22 stops
Area used for calculation 0.1 x 0.113
Camera settings Exposure time: 0.6   ISO: 400   F-number: 3.5
Focal length: 1.4 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 249 cd/m2
Luminance spread 18 cd/m2 (2 standard deviations)
Exposure value –1.81 stops   (aim for –2 to –3)
Exposure spread 0.11 stops
Area used for calculation 0.1 x 0.113
Camera settings Exposure time: 1/332   ISO: 400   F-number: 3.5
Focal length: 1.4 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0.45 cd/m2
Luminance spread 0.11 cd/m2 (2 standard deviations)
Exposure value –3.55 stops   (aim for –2 to –3)
Exposure spread 0.35 stops
Area used for calculation 0.1 x 0.113
Camera settings Exposure time: 0.5   ISO: 400   F-number: 3.5
Focal length: 1.4 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.