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

Contrast ratio results

Contrast ratio 3:1
Monitor model
Submitted 06 Aug 2019 19:04 CEST, by 148.75.*.*
Camera model Canon EOS-1D Mark IV
Processing remarks

image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 1: Overexposed. Please decrease the shutter time.
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
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 2.86 cd/m2
Luminance spread 7.35 cd/m2 (2 standard deviations)
Exposure value –2.61 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.94 x 1
Camera settings Exposure time: 1/40   ISO: 2000   F-number: 3.2
Focal length: 70.9 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 8 cd/m2
Luminance spread 19 cd/m2 (2 standard deviations)
Exposure value –2.45 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.528 x 1
Camera settings Exposure time: 1/80   ISO: 3200   F-number: 4.5
Focal length: 0 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.