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

Contrast ratio results

Contrast ratio 252:1
Monitor model
Submitted 21 Dec 2011 03:49 CET, by 24.144.*.*
Camera model Canon EOS REBEL T2i
Processing remarks

Warning: image file 1: camera was zoomed out too much.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 17.1 s (Set EV to +4.1)
Warning: image file 2: camera was zoomed out too much.
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/15 s (Set EV to +4.7)

Black
Screen photo
[open image]
Luminance 0.02 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –6.6 stops   (aim for –2 to –3)
Exposure spread 0.22 stops
Area used for calculation 0.1 x 0.1
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 1.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 4.36 cd/m2
Luminance spread 0.87 cd/m2 (2 standard deviations)
Exposure value –7.25 stops   (aim for –2 to –3)
Exposure spread 0.29 stops
Area used for calculation 0.1 x 0.1
Camera settings Exposure time: 1/395   ISO: 400   F-number: 2.8
Focal length: 1.3 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.