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

Contrast ratio results

Contrast ratio 1:1
Monitor model
Submitted 30 Dec 2016 13:11 CET, by 59.115.*.*
Camera model Canon EOS 5D Mark III
Processing remarks

Warning: using the flash makes no sense.
Warning: image file 1: camera was zoomed in too much.
Warning: image file 1: automatic white balance can cause inaccuracies.
image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Note: image file 1: suggested exposure time: 1/61 s (Set EV to +1.1)
Warning: using the flash makes no sense.
Warning: image file 2: camera was zoomed in too much.
Warning: image file 2: automatic white balance can cause inaccuracies.
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 2: Overexposed. Please decrease the shutter time.
Warning: Image ISO settings are not the same.
Warning: Image F-number settings are not the same.

Black
Screen photo
[open image]
Luminance 742 cd/m2
Luminance spread 780 cd/m2 (2 standard deviations)
Exposure value –0.88 stops   (aim for –2 to –3)
Exposure spread 1.68 stops
Area used for calculation 1 x 0.562
Camera settings Exposure time: 1/197   ISO: 400   F-number: 5.7
Focal length: 184 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 767 cd/m2
Luminance spread 2586 cd/m2 (2 standard deviations)
Exposure value –3.56 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/128   ISO: 100   F-number: 9.1
Focal length: 204 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.