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

Contrast ratio of Dell S2340m

Contrast ratio 907:1 (edge: 1388:1)
Monitor model Dell S2340m
Submitted 25 Nov 2012 08:01 CET, by 209.215.*.*
Camera model Nikon D7000
Processing remarks

image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Note: image file 3: suggested exposure time: 12.9 s (Set EV to +0.4)

Black
Screen photo
[open image]
Luminance 0.22 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –1.66 stops   (aim for –2 to –3)
Exposure spread 0.37 stops
Area used for calculation 0.388 x 0.439
Camera settings Exposure time: 15   ISO: 100   F-number: 3.5
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: -1
White
Screen photo
[open image]
Luminance 200 cd/m2
Luminance spread 40 cd/m2 (2 standard deviations)
Exposure value –2.39 stops   (aim for –2 to –3)
Exposure spread 0.29 stops
Area used for calculation 0.388 x 0.439
Camera settings Exposure time: 1/100   ISO: 100   F-number: 3.5
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: -3
Black at screen edge
Screen photo
[open image]
Luminance 0.14 cd/m2
Luminance spread 0.1 cd/m2 (2 standard deviations)
Exposure value –3.86 stops   (aim for –2 to –3)
Exposure spread 1.07 stops
Area used for calculation 0.388 x 0.439
Camera settings Exposure time: 5   ISO: 100   F-number: 3.5
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: -1

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.