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

Contrast ratio results

Contrast ratio 5166:1
Monitor model
Submitted 28 Aug 2014 06:38 CEST, by 173.183.*.*
Camera model Canon EOS REBEL T2i
Processing remarks

image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Note: image file 2: suggested exposure time: 1/290 s (Set EV to -5.2)

Black
Screen photo
[open image]
Luminance 0.05 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –2.01 stops   (aim for –2 to –3)
Exposure spread 0.31 stops
Area used for calculation 0.393 x 0.443
Camera settings Exposure time: 24.7   ISO: 200   F-number: 3.5
Focal length: 28.3 mm   (35 mm equivalent)
Exposure compensation: 1
White
Screen photo
[open image]
Luminance 272 cd/m2
Luminance spread 288 cd/m2 (2 standard deviations)
Exposure value –1.3 stops   (aim for –2 to –3)
Exposure spread 1.7 stops
Area used for calculation 0.393 x 0.443
Camera settings Exposure time: 1/128   ISO: 200   F-number: 3.5
Focal length: 28.3 mm   (35 mm equivalent)
Exposure compensation: -4

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.