Contrast ratio results for samsung cf390

Black
Contrast ratio	908569:1 (edge: 846573:1)
Monitor model	samsung cf390
Submitted	28 Dec 2018 14:09 CET, by 179.28..
Camera model	TCL 8050E
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: 1194.4 s (Set EV to +12.2) Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 3: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Warning: image file 3: Underexposed. Please increase the shutter time. Note: image file 3: suggested exposure time: 1112.9 s (Set EV to +12.1)
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–14.72 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.528 x 0.704
Camera settings	Exposure time: 1/4 ISO: 400 F-number: 2 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	115 cd/m2
Luminance spread	30 cd/m2 (2 standard deviations)
Exposure value	–1.53 stops (aim for –2 to –3)
Exposure spread	0.38 stops
Area used for calculation	0.528 x 0.704
Camera settings	Exposure time: 1/389 ISO: 400 F-number: 2 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–14.62 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.528 x 0.704
Camera settings	Exposure time: 1/4 ISO: 400 F-number: 2 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0

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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.