| Contrast ratio | 320:1 |
|---|---|
| Monitor model | acer |
| Submitted | 07 Oct 2012 14:29 CEST, by 79.118.*.* |
| Camera model | Pentax K10D |
| Processing remarks | Note: image file 1: suggested exposure time: 4.8 s (Set EV to +1.2) |
| Black | |
| Screen photo |
|
| Luminance | 0.1 cd/m2 |
| Luminance spread | 0.03 cd/m2 (2 standard deviations) |
| Exposure value | –3.75 stops (aim for –2 to –3) |
| Exposure spread | 0.45 stops |
| Area used for calculation | 0.358 x 0.477 |
| Camera settings | Exposure time: 2 ISO: 400 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 31 cd/m2 |
| Luminance spread | 16 cd/m2 (2 standard deviations) |
| Exposure value | –4.75 stops (aim for –2 to –3) |
| Exposure spread | 0.75 stops |
| Area used for calculation | 0.358 x 0.477 |
| Camera settings | Exposure time: 1/320 ISO: 400 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr022/05676a.jpg){kind=link}
![[open image]](upload/cr022/05676b.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.