| Contrast ratio | 120:1 |
|---|---|
| Monitor model | Westinghouse |
| Submitted | 03 Sep 2008 23:27 CEST, by 24.118.*.* |
| Camera model | Canon EOS 40D |
| Processing remarks | Warning: image file 1: camera was zoomed in too much. |
| Black | |
| Screen photo |
|
| Luminance | 0.6 cd/m2 |
| Luminance spread | 0.16 cd/m2 (2 standard deviations) |
| Exposure value | –3.23 stops (aim for –2 to –3) |
| Exposure spread | 0.4 stops |
| Area used for calculation | 1 x 1 |
| Camera settings | Exposure time: 0.3 ISO: 400 F-number: 2.8 Focal length: 114 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 72 cd/m2 |
| Luminance spread | 28 cd/m2 (2 standard deviations) |
| Exposure value | –2.96 stops (aim for –2 to –3) |
| Exposure spread | 0.57 stops |
| Area used for calculation | 1 x 1 |
| Camera settings | Exposure time: 1/332 ISO: 400 F-number: 2.8 Focal length: 324 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr002/00621a.jpg){kind=link}
![[open image]](upload/cr002/00621b.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.