Contrast ratio results for Viewsonic

Black
Contrast ratio	2260:1
Monitor model	Viewsonic
Submitted	09 Oct 2017 04:57 CEST, by 172.127..
Camera model	Canon PowerShot SX150 IS
Processing remarks	image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 9.9 s (Set EV to +4.3) image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Screen photo	[open image]
Luminance	0.04 cd/m2
Luminance spread	0.06 cd/m2 (2 standard deviations)
Exposure value	–6.81 stops (aim for –2 to –3)
Exposure spread	2.31 stops
Area used for calculation	0.406 x 0.406
Camera settings	Exposure time: 0.5 ISO: 400 F-number: 3.4 Focal length: 28.1 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	99 cd/m2
Luminance spread	9 cd/m2 (2 standard deviations)
Exposure value	–3.33 stops (aim for –2 to –3)
Exposure spread	0.13 stops
Area used for calculation	0.406 x 0.406
Camera settings	Exposure time: 1/403 ISO: 400 F-number: 3.4 Focal length: 28.1 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.