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

Contrast ratio results

Contrast ratio 4906:1
Monitor model
Submitted 21 Sep 2012 05:39 CEST, by 92.230.*.*
Camera model Pentax Optio S5z
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 157.2 s (Set EV to +5.3)

Black
Screen photo
[open image]
Luminance 0.01 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –7.8 stops   (aim for –2 to –3)
Exposure spread 1.14 stops
Area used for calculation 0.506 x 0.506
Camera settings Exposure time: 4   ISO: 80   F-number: 2.6
Focal length: 35 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 40 cd/m2
Luminance spread 6 cd/m2 (2 standard deviations)
Exposure value –2.18 stops   (aim for –2 to –3)
Exposure spread 0.22 stops
Area used for calculation 0.506 x 0.506
Camera settings Exposure time: 1/25   ISO: 80   F-number: 2.6
Focal length: 35 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.