| Contrast ratio | 136:1 |
|---|---|
| Monitor model | |
| Submitted | 30 Dec 2014 21:44 CET, by 216.165.*.* |
| Camera model | Canon EOS REBEL T1i |
| Processing remarks | Warning: Image focal lengths/zoom levels are not the same. |
| Black | |
| Screen photo |
|
| Luminance | 1.26 cd/m2 |
| Luminance spread | 1.98 cd/m2 (2 standard deviations) |
| Exposure value | –1.84 stops (aim for –2 to –3) |
| Exposure spread | 3.03 stops |
| Area used for calculation | 0.772 x 0.869 |
| Camera settings | Exposure time: 1 ISO: 400 F-number: 4.6 Focal length: 55.6 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 171 cd/m2 |
| Luminance spread | 39 cd/m2 (2 standard deviations) |
| Exposure value | –3.38 stops (aim for –2 to –3) |
| Exposure spread | 0.33 stops |
| Area used for calculation | 0.75 x 0.844 |
| Camera settings | Exposure time: 1/395 ISO: 400 F-number: 4.6 Focal length: 54 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr033/08355a.jpg){kind=link}
![[open image]](upload/cr033/08355b.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.