| Contrast ratio | 731:1 |
|---|---|
| Monitor model | LG 28" 4k |
| Submitted | 18 Feb 2018 04:20 CET, by 73.68.*.* |
| Camera model | Sony SLT-A58 |
| Processing remarks | Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. |
| Black | |
| Screen photo |
|
| Luminance | 0.36 cd/m2 |
| Luminance spread | 0.13 cd/m2 (2 standard deviations) |
| Exposure value | –1.96 stops (aim for –2 to –3) |
| Exposure spread | 0.54 stops |
| Area used for calculation | 1 x 1 |
| Camera settings | Exposure time: 0.6 ISO: 800 F-number: 2.8 Focal length: 75 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 262 cd/m2 |
| Luminance spread | 85 cd/m2 (2 standard deviations) |
| Exposure value | –1.68 stops (aim for –2 to –3) |
| Exposure spread | 0.47 stops |
| Area used for calculation | 1 x 1 |
| Camera settings | Exposure time: 1/1000 ISO: 800 F-number: 2.8 Focal length: 75 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr046/11683a.jpg){kind=link}
![[open image]](upload/cr046/11683b.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.