| Contrast ratio | 832:1 |
|---|---|
| Monitor model | |
| Submitted | 10 Jun 2010 20:06 CEST, by 121.203.*.* |
| Camera model | Canon EOS 400D DIGITAL |
| Processing remarks | Note: image file 1: suggested exposure time: 3.1 s (Set EV to -1.7) |
| Black | |
| Screen photo |
|
| Luminance | 0.19 cd/m2 |
| Luminance spread | 0.02 cd/m2 (2 standard deviations) |
| Exposure value | –0.83 stops (aim for –2 to –3) |
| Exposure spread | 0.18 stops |
| Area used for calculation | 0.543 x 0.612 |
| Camera settings | Exposure time: 10 ISO: 400 F-number: 4 Focal length: 39.1 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 160 cd/m2 |
| Luminance spread | 41 cd/m2 (2 standard deviations) |
| Exposure value | –3.09 stops (aim for –2 to –3) |
| Exposure spread | 0.37 stops |
| Area used for calculation | 0.586 x 0.66 |
| Camera settings | Exposure time: 1/400 ISO: 400 F-number: 4 Focal length: 42.2 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr011/02839a.jpg){kind=link}
![[open image]](upload/cr011/02839b.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.