| Contrast ratio | 185:1 |
|---|---|
| Monitor model | Dell U2412M |
| Submitted | 14 Apr 2013 16:08 CEST, by 46.9.*.* |
| Camera model | Canon EOS 20D |
| Processing remarks | Note: image file 1: suggested exposure time: 9.7 s (Set EV to +1.3) |
| Black | |
| Screen photo |
|
| Luminance | 0.25 cd/m2 |
| Luminance spread | 0.21 cd/m2 (2 standard deviations) |
| Exposure value | –3.78 stops (aim for –2 to –3) |
| Exposure spread | 1.32 stops |
| Area used for calculation | 0.378 x 0.425 |
| Camera settings | Exposure time: 4 ISO: 100 F-number: 4 Focal length: 27.2 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 46 cd/m2 |
| Luminance spread | 7 cd/m2 (2 standard deviations) |
| Exposure value | –4.89 stops (aim for –2 to –3) |
| Exposure spread | 0.21 stops |
| Area used for calculation | 0.378 x 0.425 |
| Camera settings | Exposure time: 1/100 ISO: 100 F-number: 4 Focal length: 27.2 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr025/06466a.jpg){kind=link}
![[open image]](upload/cr025/06466b.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.