Contrast ratio results

Black
Contrast ratio	1150:1 (edge: 81:1)
Monitor model
Submitted	26 Feb 2015 14:46 CET, by 14.198..
Camera model	Pentax K-7
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: 10.0 s (Set EV to +4.3) Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 2: Underexposed. Please increase the shutter time. Note: image file 2: suggested exposure time: 1/120 s (Set EV to +3.1) image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Screen photo	[open image]
Luminance	0.06 cd/m2
Luminance spread	0.07 cd/m2 (2 standard deviations)
Exposure value	–6.82 stops (aim for –2 to –3)
Exposure spread	1.82 stops
Area used for calculation	0.345 x 0.398
Camera settings	Exposure time: 0.5 ISO: 400 F-number: 4 Focal length: 25 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	70 cd/m2
Luminance spread	14 cd/m2 (2 standard deviations)
Exposure value	–5.61 stops (aim for –2 to –3)
Exposure spread	0.3 stops
Area used for calculation	0.345 x 0.398
Camera settings	Exposure time: 1/1000 ISO: 400 F-number: 4 Focal length: 25 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	0.87 cd/m2
Luminance spread	3.21 cd/m2 (2 standard deviations)
Exposure value	–2.98 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.345 x 0.398
Camera settings	Exposure time: 0.5 ISO: 400 F-number: 4 Focal length: 25 mm (35 mm equivalent) Exposure compensation: 0

{adcode}

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.