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

Contrast ratio results

Contrast ratio 601:1
Monitor model
Submitted 31 Dec 2023 10:50 CET, by 5.173.*.*
Camera model Canon PowerShot A630
Processing remarks

Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/41 s (Set EV to +4.3)
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
[open image]
Luminance 0.08 cd/m2
Luminance spread 0.05 cd/m2 (2 standard deviations)
Exposure value –3.37 stops   (aim for –2 to –3)
Exposure spread 0.91 stops
Area used for calculation 0.49 x 0.49
Camera settings Exposure time: 8   ISO: 100   F-number: 2.8
Focal length: 33.9 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 49 cd/m2
Luminance spread 17 cd/m2 (2 standard deviations)
Exposure value –6.8 stops   (aim for –2 to –3)
Exposure spread 0.5 stops
Area used for calculation 0.49 x 0.49
Camera settings Exposure time: 1/807   ISO: 100   F-number: 2.8
Focal length: 33.9 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 147 cd/m2
Luminance spread 19 cd/m2 (2 standard deviations)
Exposure value –1.85 stops   (aim for –2 to –3)
Exposure spread 0.19 stops
Area used for calculation 0.49 x 0.49
Camera settings Exposure time: 1/79   ISO: 100   F-number: 2.8
Focal length: 33.9 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.