| Contrast ratio | 292:1 |
|---|---|
| Monitor model | |
| Submitted | 11 Feb 2014 10:08 CET, by 212.106.*.* |
| Camera model | Canon EOS 50D |
| Processing remarks | Note: image file 1: suggested exposure time: 2.4 s (Set EV to -1.4) |
| Black | |
| Screen photo |
|
| Luminance | 0.26 cd/m2 |
| Luminance spread | 0.03 cd/m2 (2 standard deviations) |
| Exposure value | –1.1 stops (aim for –2 to –3) |
| Exposure spread | 0.18 stops |
| Area used for calculation | 0.617 x 0.694 |
| Camera settings | Exposure time: 6.2 ISO: 400 F-number: 4 Focal length: 44.4 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 75 cd/m2 |
| Luminance spread | 8 cd/m2 (2 standard deviations) |
| Exposure value | –1.92 stops (aim for –2 to –3) |
| Exposure spread | 0.16 stops |
| Area used for calculation | 0.617 x 0.694 |
| Camera settings | Exposure time: 1/83 ISO: 400 F-number: 4 Focal length: 44.4 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr029/07357a.jpg){kind=link}
![[open image]](upload/cr029/07357b.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.