| Contrast ratio | 108:1 |
|---|---|
| Monitor model | |
| Submitted | 08 Jan 2012 16:07 CET, by 76.108.*.* |
| Camera model | Pentax K-5 |
| Processing remarks | Note: image file 2: suggested exposure time: 1/89 s (Set EV to -1.8) |
| Black | |
| Screen photo |
|
| Luminance | 0.5 cd/m2 |
| Luminance spread | 1.04 cd/m2 (2 standard deviations) |
| Exposure value | –2.11 stops (aim for –2 to –3) |
| Exposure spread | 4.25 stops |
| Area used for calculation | 0.681 x 0.766 |
| Camera settings | Exposure time: 1.6 ISO: 400 F-number: 4 Focal length: 49 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 54 cd/m2 |
| Luminance spread | 8 cd/m2 (2 standard deviations) |
| Exposure value | –0.67 stops (aim for –2 to –3) |
| Exposure spread | 0.23 stops |
| Area used for calculation | 0.375 x 0.422 |
| Camera settings | Exposure time: 1/25 ISO: 400 F-number: 4 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr019/04829a.jpg){kind=link}
![[open image]](upload/cr019/04829b.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.