| Contrast ratio | 624:1 |
|---|---|
| Monitor model | DELL/u2311h |
| Submitted | 04 Mar 2011 07:39 CET, by 93.177.*.* |
| Camera model | Canon EOS 450D |
| Processing remarks | Warning: image file 1: camera was zoomed out too much. |
| Black | |
| Screen photo |
|
| Luminance | 0.4 cd/m2 |
| Luminance spread | 0.01 cd/m2 (2 standard deviations) |
| Exposure value | –2.75 stops (aim for –2 to –3) |
| Exposure spread | 0.05 stops |
| Area used for calculation | 0.1 x 0.113 |
| Camera settings | Exposure time: 0.5 ISO: 400 F-number: 2.5 Focal length: 1.8 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 248 cd/m2 |
| Luminance spread | 4 cd/m2 (2 standard deviations) |
| Exposure value | –0.84 stops (aim for –2 to –3) |
| Exposure spread | 0.02 stops |
| Area used for calculation | 0.1 x 0.113 |
| Camera settings | Exposure time: 1/332 ISO: 400 F-number: 2.5 Focal length: 1.8 mm (35 mm equivalent) Exposure compensation: 4 |
![[open image]](upload/cr015/03866a.jpg){kind=link}
![[open image]](upload/cr015/03866b.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.