Contrast ratio | 2428:1 |
---|---|
Monitor model | Acer Aspire 9500 |
Submitted | 26 Sep 2010 04:30 CEST, by 91.64.*.* |
Camera model | Pentax K-x |
Processing remarks | Warning: image file 1: Underexposed. Please increase the shutter time. |
Black | |
Screen photo |
|
Luminance | 0.03 cd/m2 |
Luminance spread | 0.03 cd/m2 (2 standard deviations) |
Exposure value | –8.68 stops (aim for –2 to –3) |
Exposure spread | 1.53 stops |
Area used for calculation | 0.681 x 0.766 |
Camera settings | Exposure time: 1/4 ISO: 400 F-number: 4 Focal length: 49 mm (35 mm equivalent) Exposure compensation: 0 |
White | |
Screen photo |
|
Luminance | 81 cd/m2 |
Luminance spread | 68 cd/m2 (2 standard deviations) |
Exposure value | –4.08 stops (aim for –2 to –3) |
Exposure spread | 1.29 stops |
Area used for calculation | 0.681 x 0.766 |
Camera settings | Exposure time: 1/400 ISO: 400 F-number: 4 Focal length: 49 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.