Contrast ratio results for L2250p wide

Black
Contrast ratio	2:1
Monitor model	L2250p wide
Submitted	02 Jan 2019 22:04 CET, by 82.164..
Camera model	Pentax K-x
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 18.8 s (Set EV to +6.2) Warning: image file 2: Underexposed. Please increase the shutter time. Note: image file 2: suggested exposure time: 6.9 s (Set EV to +2.8) Warning: Image F-number settings are not the same. Warning: Image focal lengths/zoom levels are not the same.
Screen photo	[open image]
Luminance	0.03 cd/m2
Luminance spread	0.02 cd/m2 (2 standard deviations)
Exposure value	–8.73 stops (aim for –2 to –3)
Exposure spread	0.99 stops
Area used for calculation	0.472 x 0.531
Camera settings	Exposure time: 1/4 ISO: 400 F-number: 4 Focal length: 34 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	0.07 cd/m2
Luminance spread	0.03 cd/m2 (2 standard deviations)
Exposure value	–5.29 stops (aim for –2 to –3)
Exposure spread	0.72 stops
Area used for calculation	0.375 x 0.422
Camera settings	Exposure time: 1 ISO: 400 F-number: 3.5 Focal length: 27 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.