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

Contrast ratio results

Contrast ratio 14771:1 (edge: 19992:1)
Monitor model
Submitted 08 Mar 2013 19:31 CET, by 68.57.*.*
Camera model Olympus C740UZ
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 61.2 s (Set EV to +7.9)
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: 1/180 s (Set EV to +1.1)
Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 108.2 s (Set EV to +8.8)
Warning: Image F-number settings are not the same.
Warning: Image focal lengths/zoom levels are not the same.

Black
Screen photo
[open image]
Luminance 0 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –10.43 stops   (aim for –2 to –3)
Exposure spread 1.89 stops
Area used for calculation 0.55 x 0.55
Camera settings Exposure time: 1/4   ISO: 400   F-number: 2.8
Focal length: 38.1 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 72 cd/m2
Luminance spread 23 cd/m2 (2 standard deviations)
Exposure value –3.61 stops   (aim for –2 to –3)
Exposure spread 0.47 stops
Area used for calculation 0.715 x 0.715
Camera settings Exposure time: 1/400   ISO: 400   F-number: 3.2
Focal length: 49.5 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –11.26 stops   (aim for –2 to –3)
Exposure spread 2.9 stops
Area used for calculation 0.55 x 0.55
Camera settings Exposure time: 1/4   ISO: 400   F-number: 3.2
Focal length: 38.1 mm   (35 mm equivalent)
Exposure compensation: 0
{adcode}

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.