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

Contrast ratio results

Contrast ratio 1616:1
Monitor model
Submitted 16 Sep 2012 14:24 CEST, by 42.2.*.*
Camera model Sony DSLR-A300
Processing remarks

Note: image file 1: suggested exposure time: 30.6 s (Set EV to +1.0)
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/210 s (Set EV to -2.4)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.06 cd/m2
Luminance spread 0.05 cd/m2 (2 standard deviations)
Exposure value –3.53 stops   (aim for –2 to –3)
Exposure spread 1.29 stops
Area used for calculation 0.5 x 0.562
Camera settings Exposure time: 15   ISO: 100   F-number: 3.5
Focal length: 36 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 98 cd/m2
Luminance spread 3 cd/m2 (2 standard deviations)
Exposure value –0.1 stops   (aim for –2 to –3)
Exposure spread 0.05 stops
Area used for calculation 0.5 x 0.562
Camera settings Exposure time: 1/40   ISO: 400   F-number: 3.5
Focal length: 36 mm   (35 mm equivalent)
Exposure compensation: 0
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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.