| Contrast ratio | 478:1 |
|---|---|
| Monitor model | hp |
| Submitted | 04 Dec 2008 21:40 CET, by 209.195.*.* |
| Camera model | Canon EOS 40D |
| Processing remarks |
|
| Black | |
| Screen photo |
|
| Luminance | 0.18 cd/m2 |
| Luminance spread | 0.05 cd/m2 (2 standard deviations) |
| Exposure value | –1.48 stops (aim for –2 to –3) |
| Exposure spread | 0.43 stops |
| Area used for calculation | 0.45 x 0.507 |
| Camera settings | Exposure time: 5.2 ISO: 400 F-number: 3.5 Focal length: 32.4 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 86 cd/m2 |
| Luminance spread | 19 cd/m2 (2 standard deviations) |
| Exposure value | –1.96 stops (aim for –2 to –3) |
| Exposure spread | 0.32 stops |
| Area used for calculation | 0.45 x 0.507 |
| Camera settings | Exposure time: 1/128 ISO: 400 F-number: 3.5 Focal length: 32.4 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr003/00865a.jpg){kind=link}
![[open image]](upload/cr003/00865b.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.