| Contrast ratio | 448:1 |
|---|---|
| Monitor model | acer xb241H |
| Submitted | 11 Feb 2017 22:01 CET, by 86.179.*.* |
| Camera model | Nikon D3100 |
| Processing remarks | Note: image file 2: suggested exposure time: 1/71 s (Set EV to -1.2) |
| Black | |
| Screen photo |
|
| Luminance | 0.29 cd/m2 |
| Luminance spread | 0.23 cd/m2 (2 standard deviations) |
| Exposure value | –2.16 stops (aim for –2 to –3) |
| Exposure spread | 1.21 stops |
| Area used for calculation | 0.375 x 0.422 |
| Camera settings | Exposure time: 2 ISO: 400 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 131 cd/m2 |
| Luminance spread | 17 cd/m2 (2 standard deviations) |
| Exposure value | –1.26 stops (aim for –2 to –3) |
| Exposure spread | 0.18 stops |
| Area used for calculation | 0.375 x 0.422 |
| Camera settings | Exposure time: 1/30 ISO: 100 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr042/10539a.jpg){kind=link}
![[open image]](upload/cr042/10539b.jpg){kind=link}
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.