Contrast ratio | 43:1 |
---|---|
Monitor model | |
Submitted | 05 Apr 2009 06:53 CEST, by 58.107.*.* |
Camera model | Canon PowerShot A720 IS |
Processing remarks | Note: image file 1: suggested exposure time: 0.9 s (Set EV to +1.2) |
Black | |
Screen photo |
|
Luminance | 0.32 cd/m2 |
Luminance spread | 0.03 cd/m2 (2 standard deviations) |
Exposure value | –3.7 stops (aim for –2 to –3) |
Exposure spread | 0.13 stops |
Area used for calculation | 0.495 x 0.495 |
Camera settings | Exposure time: 0.4 ISO: 400 F-number: 2.8 Focal length: 34.3 mm (35 mm equivalent) Exposure compensation: 0 |
White | |
Screen photo |
|
Luminance | 14 cd/m2 |
Luminance spread | 4 cd/m2 (2 standard deviations) |
Exposure value | –4.27 stops (aim for –2 to –3) |
Exposure spread | 0.44 stops |
Area used for calculation | 0.495 x 0.495 |
Camera settings | Exposure time: 1/159 ISO: 400 F-number: 2.8 Focal length: 34.3 mm (35 mm equivalent) Exposure compensation: 0 |
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.