| Contrast ratio | 1137:1 |
|---|---|
| Monitor model | Acer |
| Submitted | 18 Jul 2011 13:59 CEST, by 58.7.*.* |
| Camera model | Pentax K200D |
| Processing remarks | Note: image file 1: suggested exposure time: 2.6 s (Set EV to +1.1) |
| Black | |
| Screen photo |
|
| Luminance | 0.11 cd/m2 |
| Luminance spread | 0.06 cd/m2 (2 standard deviations) |
| Exposure value | –3.88 stops (aim for –2 to –3) |
| Exposure spread | 0.72 stops |
| Area used for calculation | 1 x 1 |
| Camera settings | Exposure time: 1 ISO: 100 F-number: 1.4 Focal length: 75 mm (35 mm equivalent) Exposure compensation: -0.3 |
| White | |
| Screen photo |
|
| Luminance | 130 cd/m2 |
| Luminance spread | 65 cd/m2 (2 standard deviations) |
| Exposure value | –3.37 stops (aim for –2 to –3) |
| Exposure spread | 0.74 stops |
| Area used for calculation | 1 x 1 |
| Camera settings | Exposure time: 1/800 ISO: 100 F-number: 1.4 Focal length: 75 mm (35 mm equivalent) Exposure compensation: -0.7 |
![[open image]](upload/cr017/04286a.jpg){kind=link}
![[open image]](upload/cr017/04286b.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.