| Contrast ratio | 22:1 |
|---|---|
| Monitor model | Proview PZ456 |
| Submitted | 14 Jun 2008 09:02 CEST, by 58.176.*.* |
| Camera model | Canon PowerShot A650 IS |
| Processing remarks | Warning: image file 1: camera was zoomed in too much. |
| Black | |
| Screen photo |
|
| Luminance | 2.34 cd/m2 |
| Luminance spread | 4.4 cd/m2 (2 standard deviations) |
| Exposure value | –2.23 stops (aim for –2 to –3) |
| Exposure spread | 4.25 stops |
| Area used for calculation | 1 x 1 |
| Camera settings | Exposure time: 1 ISO: 80 F-number: 3.2 Focal length: 216 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 51 cd/m2 |
| Luminance spread | 32 cd/m2 (2 standard deviations) |
| Exposure value | –1.73 stops (aim for –2 to –3) |
| Exposure spread | 0.93 stops |
| Area used for calculation | 0.5 x 0.5 |
| Camera settings | Exposure time: 1/10 ISO: 80 F-number: 4 Focal length: 34.6 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr001/00375a.jpg){kind=link}
![[open image]](upload/cr001/00375b.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.