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

Contrast ratio results for Acer S240HL

Contrast ratio 1168:1
Monitor model Acer S240HL
Submitted 30 Aug 2016 10:34 CEST, by 74.67.*.*
Camera model Panasonic DMC-FZ40
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 3.5 s (Set EV to +1.8)
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.

Black
Screen photo
[open image]
Luminance 0.09 cd/m2
Luminance spread 0.08 cd/m2 (2 standard deviations)
Exposure value –4.3 stops   (aim for –2 to –3)
Exposure spread 1.52 stops
Area used for calculation 0.36 x 0.408
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 100 cd/m2
Luminance spread 10 cd/m2 (2 standard deviations)
Exposure value –2.75 stops   (aim for –2 to –3)
Exposure spread 0.15 stops
Area used for calculation 0.36 x 0.408
Camera settings Exposure time: 1/400   ISO: 400   F-number: 2.8
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: -0.66

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.