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

Contrast ratio results

Contrast ratio 228:1
Monitor model
Submitted 07 Dec 2014 20:59 CET, by 83.26.*.*
Camera model Sony SLT-A77V
Processing remarks

Warning: image file 1: Overexposed. Please decrease the shutter time.
Note: image file 1: suggested exposure time: 0.5 s (Set EV to -1.5)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.32 cd/m2
Luminance spread 0.3 cd/m2 (2 standard deviations)
Exposure value –1.01 stops   (aim for –2 to –3)
Exposure spread 1.46 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1.3   ISO: 800   F-number: 2.8
Focal length: 75 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 73 cd/m2
Luminance spread 36 cd/m2 (2 standard deviations)
Exposure value –1.88 stops   (aim for –2 to –3)
Exposure spread 0.72 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/80   ISO: 200   F-number: 2.8
Focal length: 75 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.