| Contrast ratio | 910:1 |
|---|---|
| Monitor model | Lenovo L220x |
| Submitted | 09 Jun 2008 21:02 CEST, by 189.47.*.* |
| Camera model | Nikon D40 |
| Processing remarks |
|
| Black | |
| Screen photo |
|
| Luminance | 0.3 cd/m2 |
| Luminance spread | 0.11 cd/m2 (2 standard deviations) |
| Exposure value | –2.1 stops (aim for –2 to –3) |
| Exposure spread | 0.52 stops |
| Area used for calculation | 0.375 x 0.423 |
| Camera settings | Exposure time: 1 ISO: 800 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: -1 |
| White | |
| Screen photo |
|
| Luminance | 277 cd/m2 |
| Luminance spread | 10 cd/m2 (2 standard deviations) |
| Exposure value | –0.6 stops (aim for –2 to –3) |
| Exposure spread | 0.05 stops |
| Area used for calculation | 0.375 x 0.423 |
| Camera settings | Exposure time: 1/320 ISO: 800 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: -1 |
![[open image]](upload/cr001/00358a.jpg){kind=link}
![[open image]](upload/cr001/00358b.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.