Contrast ratio | Test results | LCD test | Small-screen tests | Lagom home

Contrast ratio results

Contrast ratio 1016:1 (edge: 310:1)
Monitor model
Submitted 26 Feb 2015 14:59 CET, by 14.198.*.*
Camera model Pentax K-7
Processing remarks

image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 3: Overexposed. Please decrease the shutter time.

Black
Screen photo
[open image]
Luminance 0.16 cd/m2
Luminance spread 0.08 cd/m2 (2 standard deviations)
Exposure value –2.38 stops   (aim for –2 to –3)
Exposure spread 0.73 stops
Area used for calculation 0.347 x 0.39
Camera settings Exposure time: 4   ISO: 400   F-number: 4
Focal length: 25 mm   (35 mm equivalent)
Exposure compensation: -1.7
White
Screen photo
[open image]
Luminance 167 cd/m2
Luminance spread 18 cd/m2 (2 standard deviations)
Exposure value –2.35 stops   (aim for –2 to –3)
Exposure spread 0.16 stops
Area used for calculation 0.347 x 0.39
Camera settings Exposure time: 1/250   ISO: 400   F-number: 4
Focal length: 25 mm   (35 mm equivalent)
Exposure compensation: -1
Black at screen edge
Screen photo
[open image]
Luminance 0.54 cd/m2
Luminance spread 1.66 cd/m2 (2 standard deviations)
Exposure value –1.99 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.347 x 0.39
Camera settings Exposure time: 1.6   ISO: 400   F-number: 4
Focal length: 25 mm   (35 mm equivalent)
Exposure compensation: -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.