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

Contrast ratio results

Contrast ratio 2.2596e+07:1
Monitor model
Submitted 26 May 2020 16:39 CEST, by 188.163.*.*
Camera model Sony SLT-A77V
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 28896.6 s (Set EV to +23.5)
Warning: image file 2: camera was zoomed in too much.
image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Note: image file 3: suggested exposure time: 1/370 s (Set EV to -0.9)
Warning: Image F-number settings are not the same.
Warning: Image focal lengths/zoom levels are not the same.
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 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –25.96 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.333 x 0.375
Camera settings Exposure time: 1/400   ISO: 400   F-number: 3.5
Focal length: 24 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 362 cd/m2
Luminance spread 110 cd/m2 (2 standard deviations)
Exposure value –1.89 stops   (aim for –2 to –3)
Exposure spread 0.44 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/200   ISO: 400   F-number: 5.6
Focal length: 90 mm   (35 mm equivalent)
Exposure compensation: 0.7
Black at screen edge
Screen photo
[open image]
Luminance 171 cd/m2
Luminance spread 244 cd/m2 (2 standard deviations)
Exposure value –0.94 stops   (aim for –2 to –3)
Exposure spread 2.59 stops
Area used for calculation 0.333 x 0.375
Camera settings Exposure time: 1/125   ISO: 400   F-number: 3.5
Focal length: 24 mm   (35 mm equivalent)
Exposure compensation: 0.7
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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.