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

Contrast ratio results for TV

Contrast ratio 19662:1
Monitor model TV
Submitted 01 Jul 2021 17:47 CEST, by 103.139.*.*
Camera model Sony ILCE-7M3
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 36.2 s (Set EV to +8.2)
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.

Black
Screen photo
[open image]
Luminance 0.01 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –10.68 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.236 x 0.266
Camera settings Exposure time: 1/8   ISO: 800   F-number: 5
Focal length: 17 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 257 cd/m2
Luminance spread 100 cd/m2 (2 standard deviations)
Exposure value –3.7 stops   (aim for –2 to –3)
Exposure spread 0.57 stops
Area used for calculation 0.236 x 0.266
Camera settings Exposure time: 1/1250   ISO: 800   F-number: 5
Focal length: 17 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.