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

Contrast ratio results for Acer

Contrast ratio 1137:1
Monitor model Acer
Submitted 18 Jul 2011 13:59 CEST, by 58.7.*.*
Camera model Pentax K200D
Processing remarks

Note: image file 1: suggested exposure time: 2.6 s (Set EV to +1.1)
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.

Black
Screen photo
[open image]
Luminance 0.11 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –3.88 stops   (aim for –2 to –3)
Exposure spread 0.72 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1   ISO: 100   F-number: 1.4
Focal length: 75 mm   (35 mm equivalent)
Exposure compensation: -0.3
White
Screen photo
[open image]
Luminance 130 cd/m2
Luminance spread 65 cd/m2 (2 standard deviations)
Exposure value –3.37 stops   (aim for –2 to –3)
Exposure spread 0.74 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/800   ISO: 100   F-number: 1.4
Focal length: 75 mm   (35 mm equivalent)
Exposure compensation: -0.7

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.