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

Contrast ratio results

Contrast ratio 68988:1
Monitor model
Submitted 07 Oct 2008 04:40 CEST, by 97.90.*.*
Camera model Canon EOS DIGITAL REBEL
Processing remarks

Warning: image file 1: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 179.6 s (Set EV to +16.8)
Note: image file 2: suggested exposure time: 1/380 s (Set EV to -1.6)

Black
Screen photo
[open image]
Luminance 0 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –19.31 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.387 x 0.436
Camera settings Exposure time: 1/640   ISO: 400   F-number: 3.5
Focal length: 27.9 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 178 cd/m2
Luminance spread 30 cd/m2 (2 standard deviations)
Exposure value –0.88 stops   (aim for –2 to –3)
Exposure spread 0.24 stops
Area used for calculation 0.387 x 0.436
Camera settings Exposure time: 1/125   ISO: 400   F-number: 3.5
Focal length: 27.9 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.