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Contrast ratio results for benq gl2450

Contrast ratio 843:1
Monitor model benq gl2450
Submitted 25 Sep 2019 13:24 CEST, by 92.2.*.*
Camera model Sony J8110
Processing remarks

Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 4.9 s (Set EV to +5.3)
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
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: 1/170 s (Set EV to +3.5)

Black
Screen photo
[open image]
Luminance 0.02 cd/m2
Luminance spread 0.03 cd/m2 (2 standard deviations)
Exposure value –7.81 stops   (aim for –2 to –3)
Exposure spread 2.89 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 1/8   ISO: 400   F-number: 1.6
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 16 cd/m2
Luminance spread 7 cd/m2 (2 standard deviations)
Exposure value –6.05 stops   (aim for –2 to –3)
Exposure spread 0.58 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 1/1992   ISO: 400   F-number: 1.6
Focal length: 0 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.