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

Contrast ratio results

Contrast ratio 1454:1 (edge: 1944:1)
Monitor model
Submitted 21 Jun 2009 15:02 CEST, by 125.25.*.*
Camera model Sony DSC-W50
Processing remarks

Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 3: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 2.3 s (Set EV to +1.6)

Black
Screen photo
[open image]
Luminance 0.17 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –3.31 stops   (aim for –2 to –3)
Exposure spread 0.32 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 1.7
White
Screen photo
[open image]
Luminance 245 cd/m2
Luminance spread 32 cd/m2 (2 standard deviations)
Exposure value –1.77 stops   (aim for –2 to –3)
Exposure spread 0.19 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 1/500   ISO: 400   F-number: 2.8
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0.13 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –4.05 stops   (aim for –2 to –3)
Exposure spread 0.47 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 0.8   ISO: 400   F-number: 2.8
Focal length: 0 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.