| Contrast ratio | 1445:1 |
|---|---|
| Monitor model | BENQ gw2250 |
| Submitted | 06 Jul 2013 06:54 CEST, by 117.65.*.* |
| Camera model | Canon EOS 400D DIGITAL |
| Processing remarks | Note: image file 1: suggested exposure time: 5.7 s (Set EV to +1.5) |
| Black | |
| Screen photo |
|
| Luminance | 0.11 cd/m2 |
| Luminance spread | 0.12 cd/m2 (2 standard deviations) |
| Exposure value | –4.01 stops (aim for –2 to –3) |
| Exposure spread | 1.74 stops |
| Area used for calculation | 0.394 x 0.431 |
| Camera settings | Exposure time: 2 ISO: 400 F-number: 4 Focal length: 28.1 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 154 cd/m2 |
| Luminance spread | 36 cd/m2 (2 standard deviations) |
| Exposure value | –2.48 stops (aim for –2 to –3) |
| Exposure spread | 0.34 stops |
| Area used for calculation | 0.379 x 0.472 |
| Camera settings | Exposure time: 1/250 ISO: 400 F-number: 4 Focal length: 28.1 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr026/06681a.jpg){kind=link}
![[open image]](upload/cr026/06681b.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.