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

Contrast ratio results for 37" dynex

Contrast ratio 7:1
Monitor model 37" dynex
Submitted 17 Jul 2014 08:17 CEST, by 70.67.*.*
Camera model Canon PowerShot S3 IS
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/29 s (Set EV to +3.8)

Black
Screen photo
[open image]
Luminance 8 cd/m2
Luminance spread 3 cd/m2 (2 standard deviations)
Exposure value –6.32 stops   (aim for –2 to –3)
Exposure spread 0.47 stops
Area used for calculation 0.513 x 0.513
Camera settings Exposure time: 1/403   ISO: 400   F-number: 2.7
Focal length: 35.5 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 56 cd/m2
Luminance spread 8 cd/m2 (2 standard deviations)
Exposure value –2.81 stops   (aim for –2 to –3)
Exposure spread 0.21 stops
Area used for calculation 0.513 x 0.513
Camera settings Exposure time: 1/251   ISO: 400   F-number: 2.7
Focal length: 35.5 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.