| Contrast ratio | 342:1 |
|---|---|
| Monitor model | HP Compaq 6720s |
| Submitted | 29 Jun 2011 21:10 CEST, by 94.132.*.* |
| Camera model | CASIO COMPUTER CO.LTD. EX-Z90 |
| Processing remarks | Note: image file 1: suggested exposure time: 0.6 s (Set EV to +1.5) |
| Black | |
| Screen photo |
|
| Luminance | 0.66 cd/m2 |
| Luminance spread | 1.38 cd/m2 (2 standard deviations) |
| Exposure value | –3.97 stops (aim for –2 to –3) |
| Exposure spread | 4.25 stops |
| Area used for calculation | 0.506 x 0.506 |
| Camera settings | Exposure time: 1/5 ISO: 400 F-number: 3.1 Focal length: 35 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 224 cd/m2 |
| Luminance spread | 72 cd/m2 (2 standard deviations) |
| Exposure value | –1.19 stops (aim for –2 to –3) |
| Exposure spread | 0.47 stops |
| Area used for calculation | 0.506 x 0.506 |
| Camera settings | Exposure time: 1/250 ISO: 400 F-number: 3.1 Focal length: 35 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr016/04218a.jpg){kind=link}
![[open image]](upload/cr016/04218b.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.