| Contrast ratio | 109:1 |
|---|---|
| Monitor model | |
| Submitted | 17 Oct 2016 20:02 CEST, by 128.0.*.* |
| Camera model | Canon EOS 500D |
| Processing remarks | Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. |
| Black | |
| Screen photo |
|
| Luminance | 1.65 cd/m2 |
| Luminance spread | 1.87 cd/m2 (2 standard deviations) |
| Exposure value | –1.57 stops (aim for –2 to –3) |
| Exposure spread | 1.84 stops |
| Area used for calculation | 0.794 x 0.894 |
| Camera settings | Exposure time: 1 ISO: 400 F-number: 4.8 Focal length: 57.2 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 181 cd/m2 |
| Luminance spread | 69 cd/m2 (2 standard deviations) |
| Exposure value | –4.3 stops (aim for –2 to –3) |
| Exposure spread | 0.56 stops |
| Area used for calculation | 0.794 x 0.894 |
| Camera settings | Exposure time: 1/724 ISO: 400 F-number: 4.8 Focal length: 57.2 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr040/10053a.jpg){kind=link}
![[open image]](upload/cr040/10053b.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.