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

Contrast ratio results

Contrast ratio 1515:1 (edge: 1631:1)
Monitor model
Submitted 25 Jan 2010 21:25 CET, by 78.53.*.*
Camera model Sony DSLR-A700
Processing remarks

Note: image file 1: suggested exposure time: 13.0 s (Set EV to -0.9)
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/120 s (Set EV to -0.5)
Note: image file 3: suggested exposure time: 14.0 s (Set EV to -0.8)

Black
Screen photo
[open image]
Luminance 0.07 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –3.87 stops   (aim for –2 to –3)
Exposure spread 0.23 stops
Area used for calculation 0.375 x 0.421
Camera settings Exposure time: 5   ISO: 400   F-number: 5
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: -2.3
White
Screen photo
[open image]
Luminance 110 cd/m2
Luminance spread 20 cd/m2 (2 standard deviations)
Exposure value –4.28 stops   (aim for –2 to –3)
Exposure spread 0.27 stops
Area used for calculation 0.375 x 0.421
Camera settings Exposure time: 1/400   ISO: 400   F-number: 5
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: -2.3
Black at screen edge
Screen photo
[open image]
Luminance 0.07 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –3.98 stops   (aim for –2 to –3)
Exposure spread 0.27 stops
Area used for calculation 0.375 x 0.421
Camera settings Exposure time: 5   ISO: 400   F-number: 5
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: -2.3

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.