Contrast ratio of Acer P215H

Black
Contrast ratio	1256:1 (edge: 1367:1)
Monitor model	Acer P215H
Submitted	07 Nov 2014 04:34 CET, by 66.219..
Camera model	Canon EOS REBEL T4i
Processing remarks	Note: image file 3: suggested exposure time: 2.0 s (Set EV to +1.0)
Screen photo	[open image]
Luminance	0.25 cd/m2
Luminance spread	0.09 cd/m2 (2 standard deviations)
Exposure value	–3.41 stops (aim for –2 to –3)
Exposure spread	0.52 stops
Area used for calculation	0.396 x 0.445
Camera settings	Exposure time: 1 ISO: 400 F-number: 3.5 Focal length: 28.5 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	310 cd/m2
Luminance spread	40 cd/m2 (2 standard deviations)
Exposure value	–1.74 stops (aim for –2 to –3)
Exposure spread	0.19 stops
Area used for calculation	0.396 x 0.445
Camera settings	Exposure time: 1/395 ISO: 400 F-number: 3.5 Focal length: 28.5 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	0.23 cd/m2
Luminance spread	0.1 cd/m2 (2 standard deviations)
Exposure value	–3.53 stops (aim for –2 to –3)
Exposure spread	0.62 stops
Area used for calculation	0.396 x 0.445
Camera settings	Exposure time: 1 ISO: 400 F-number: 3.5 Focal length: 28.5 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.