Contrast ratio results

Black
Contrast ratio	3326:1
Monitor model
Submitted	04 Apr 2018 04:03 CEST, by 134.76..
Camera model	Pentax K-50
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 5.8 s (Set EV to +2.0) 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.
Screen photo	[open image]
Luminance	0.02 cd/m2
Luminance spread	0.02 cd/m2 (2 standard deviations)
Exposure value	–6.78 stops (aim for –2 to –3)
Exposure spread	1.66 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 0.3 ISO: 400 F-number: 1.8 Focal length: 75 mm (35 mm equivalent) Exposure compensation: -2.3
White
Screen photo	[open image]
Luminance	70 cd/m2
Luminance spread	46 cd/m2 (2 standard deviations)
Exposure value	–5.64 stops (aim for –2 to –3)
Exposure spread	0.99 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/5000 ISO: 400 F-number: 1.8 Focal length: 75 mm (35 mm equivalent) Exposure compensation: -2.3

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.