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

Contrast ratio results

Contrast ratio 42403:1 (edge: 39438:1)
Monitor model
Submitted 01 Mar 2022 17:06 CET, by 140.146.*.*
Camera model Canon EOS REBEL T5
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 169.2 s (Set EV to +8.4)
Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 157.3 s (Set EV to +8.3)

Black
Screen photo
[open image]
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –10.9 stops   (aim for –2 to –3)
Exposure spread 1.61 stops
Area used for calculation 0.393 x 0.442
Camera settings Exposure time: 0.5   ISO: 400   F-number: 4
Focal length: 28.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 152 cd/m2
Luminance spread 32 cd/m2 (2 standard deviations)
Exposure value –3.16 stops   (aim for –2 to –3)
Exposure spread 0.31 stops
Area used for calculation 0.393 x 0.442
Camera settings Exposure time: 1/395   ISO: 400   F-number: 4
Focal length: 28.3 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –10.8 stops   (aim for –2 to –3)
Exposure spread 1.1 stops
Area used for calculation 0.393 x 0.442
Camera settings Exposure time: 0.5   ISO: 400   F-number: 4
Focal length: 28.3 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.