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

Contrast ratio results for Acer

Contrast ratio 1808:1 (edge: 1453:1)
Monitor model Acer
Submitted 29 Jan 2022 20:43 CET, by 86.24.*.*
Camera model Canon EOS M50
Processing remarks

Note: image file 1: suggested exposure time: 2.6 s (Set EV to +1.4)
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Note: image file 3: suggested exposure time: 2.1 s (Set EV to +1.4)
Warning: Image focal lengths/zoom levels are not the same.

Black
Screen photo
[open image]
Luminance 0.23 cd/m2
Luminance spread 0.24 cd/m2 (2 standard deviations)
Exposure value –3.88 stops   (aim for –2 to –3)
Exposure spread 1.63 stops
Area used for calculation 0.489 x 0.55
Camera settings Exposure time: 1   ISO: 400   F-number: 4
Focal length: 35.2 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 419 cd/m2
Luminance spread 135 cd/m2 (2 standard deviations)
Exposure value –2.39 stops   (aim for –2 to –3)
Exposure spread 0.47 stops
Area used for calculation 0.489 x 0.55
Camera settings Exposure time: 1/640   ISO: 400   F-number: 4
Focal length: 35.2 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0.29 cd/m2
Luminance spread 0.96 cd/m2 (2 standard deviations)
Exposure value –3.89 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.349 x 0.392
Camera settings Exposure time: 0.8   ISO: 400   F-number: 4
Focal length: 25.1 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.