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

Contrast ratio results for FW-900

Contrast ratio 372550:1
Monitor model FW-900
Submitted 06 Apr 2008 06:35 CEST, by 75.83.*.*
Camera model Canon PowerShot A530
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 1378.2 s (Set EV to +6.5)
Note: image file 2: suggested exposure time: 1/270 s (Set EV to -1.8)

Black
Screen photo
[open image]
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –9.02 stops   (aim for –2 to –3)
Exposure spread 0.89 stops
Area used for calculation 0.497 x 0.497
Camera settings Exposure time: 15   ISO: 200   F-number: 2.6
Focal length: 34.4 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 138 cd/m2
Luminance spread 34 cd/m2 (2 standard deviations)
Exposure value –0.73 stops   (aim for –2 to –3)
Exposure spread 0.35 stops
Area used for calculation 0.497 x 0.497
Camera settings Exposure time: 1/79   ISO: 200   F-number: 2.6
Focal length: 34.4 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.