| Contrast ratio | 241:1 |
|---|---|
| Monitor model | |
| Submitted | 18 Jul 2012 18:31 CEST, by 202.156.*.* |
| Camera model | Pentax K-x |
| Processing remarks | Note: image file 2: suggested exposure time: 1/98 s (Set EV to -1.7) |
| Black | |
| Screen photo |
|
| Luminance | 0.25 cd/m2 |
| Luminance spread | 0.43 cd/m2 (2 standard deviations) |
| Exposure value | –2.83 stops (aim for –2 to –3) |
| Exposure spread | 3.88 stops |
| Area used for calculation | 0.375 x 0.422 |
| Camera settings | Exposure time: 1.5 ISO: 400 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 59 cd/m2 |
| Luminance spread | 10 cd/m2 (2 standard deviations) |
| Exposure value | –0.8 stops (aim for –2 to –3) |
| Exposure spread | 0.25 stops |
| Area used for calculation | 0.417 x 0.469 |
| Camera settings | Exposure time: 1/30 ISO: 400 F-number: 4 Focal length: 30 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr021/05365a.jpg){kind=link}
![[open image]](upload/cr021/05365b.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.