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

Contrast ratio results for Benq BL902LED_DSUB

Contrast ratio 12020:1 (edge: 58:1)
Monitor model Benq BL902LED_DSUB
Submitted 22 Oct 2011 16:01 CEST, by 95.54.*.*
Camera model Panasonic DMC-LS80
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 42.1 s (Set EV to +8.4)
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 1/4 s (Set EV to +2.0)

Black
Screen photo
[open image]
Luminance 0.01 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –10.9 stops   (aim for –2 to –3)
Exposure spread 0.9 stops
Area used for calculation 0.477 x 0.477
Camera settings Exposure time: 1/8   ISO: 400   F-number: 2.8
Focal length: 33 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 84 cd/m2
Luminance spread 36 cd/m2 (2 standard deviations)
Exposure value –1.67 stops   (aim for –2 to –3)
Exposure spread 0.62 stops
Area used for calculation 0.477 x 0.477
Camera settings Exposure time: 1/160   ISO: 400   F-number: 2.8
Focal length: 33 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 1.46 cd/m2
Luminance spread 10.62 cd/m2 (2 standard deviations)
Exposure value –4.52 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.549 x 0.549
Camera settings Exposure time: 1/20   ISO: 400   F-number: 2.8
Focal length: 38 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.