Contrast ratio results for lenovo G50

Black
Contrast ratio	1:1 (edge: 13:1)
Monitor model	lenovo G50
Submitted	03 Jul 2017 20:00 CEST, by 104.138..
Camera model	Canon EOS 6D
Processing remarks	Warning: using the flash makes no sense. Warning: image file 1: camera was zoomed in too much. image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 1: Overexposed. Please decrease the shutter time. Note: image file 1: suggested exposure time: 1/200 s (Set EV to -1.3) Warning: using the flash makes no sense. Warning: image file 2: camera was zoomed in too much. image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 2: Overexposed. Please decrease the shutter time. Note: image file 2: suggested exposure time: 1/200 s (Set EV to -1.3) Warning: using the flash makes no sense. Warning: image file 3: 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. Warning: image file 3: Underexposed. Please increase the shutter time. Note: image file 3: suggested exposure time: 1/12 s (Set EV to +3.4) Warning: Image F-number settings are not the same. Warning: Image focal lengths/zoom levels are not the same.
Screen photo	[open image]
Luminance	300 cd/m2
Luminance spread	586 cd/m2 (2 standard deviations)
Exposure value	–1.21 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	1 x 0.5
Camera settings	Exposure time: 1/80 ISO: 200 F-number: 4.5 Focal length: 95 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	302 cd/m2
Luminance spread	586 cd/m2 (2 standard deviations)
Exposure value	–1.2 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	1 x 0.5
Camera settings	Exposure time: 1/80 ISO: 200 F-number: 4.5 Focal length: 95 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	23 cd/m2
Luminance spread	86 cd/m2 (2 standard deviations)
Exposure value	–5.88 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	1 x 0.5
Camera settings	Exposure time: 1/125 ISO: 200 F-number: 5 Focal length: 120 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.