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

Contrast ratio results

Contrast ratio 56:1 (edge: 207:1)
Monitor model
Submitted 09 May 2016 01:22 CEST, by 217.99.*.*
Camera model Nikon COOLPIX A
Processing remarks

Warning: image file 1: Overexposed. Please decrease the shutter time.
Note: image file 1: suggested exposure time: 1/12 s (Set EV to -1.8)
Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 0.3 s (Set EV to +1.6)

Black
Screen photo
[open image]
Luminance 3.47 cd/m2
Luminance spread 3.65 cd/m2 (2 standard deviations)
Exposure value –0.69 stops   (aim for –2 to –3)
Exposure spread 1.68 stops
Area used for calculation 0.388 x 0.439
Camera settings Exposure time: 0.3   ISO: 400   F-number: 2.8
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 196 cd/m2
Luminance spread 47 cd/m2 (2 standard deviations)
Exposure value –1.1 stops   (aim for –2 to –3)
Exposure spread 0.35 stops
Area used for calculation 0.388 x 0.439
Camera settings Exposure time: 1/250   ISO: 400   F-number: 2.8
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0.94 cd/m2
Luminance spread 2.26 cd/m2 (2 standard deviations)
Exposure value –4.15 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.388 x 0.439
Camera settings Exposure time: 1/10   ISO: 400   F-number: 2.8
Focal length: 28 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.