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

Contrast ratio results for Apple Cinema 24"

Contrast ratio 12194:1
Monitor model Apple Cinema 24"
Submitted 13 Oct 2016 01:07 CEST, by 75.118.*.*
Camera model Canon EOS 6D
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 29.2 s (Set EV to +11.2)
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.
Note: image file 2: suggested exposure time: 1/420 s (Set EV to -2.3)
Warning: Image focal lengths/zoom levels are not the same.

Black
Screen photo
[open image]
Luminance 0.01 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –13.74 stops   (aim for –2 to –3)
Exposure spread 1.12 stops
Area used for calculation 0.507 x 0.57
Camera settings Exposure time: 1/83   ISO: 800   F-number: 4
Focal length: 36.5 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 126 cd/m2
Luminance spread 10 cd/m2 (2 standard deviations)
Exposure value –0.17 stops   (aim for –2 to –3)
Exposure spread 0.12 stops
Area used for calculation 0.481 x 0.541
Camera settings Exposure time: 1/83   ISO: 800   F-number: 4
Focal length: 34.6 mm   (35 mm equivalent)
Exposure compensation: 0
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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.