Contrast ratio | 113:1 |
---|---|
Monitor model | |
Submitted | 18 Jul 2012 18:27 CEST, by 202.156.*.* |
Camera model | Pentax K-x |
Processing remarks | Warning: image file 1: Overexposed. Please decrease the shutter time. |
Black | |
Screen photo |
|
Luminance | 0.23 cd/m2 |
Luminance spread | 0.25 cd/m2 (2 standard deviations) |
Exposure value | –0.94 stops (aim for –2 to –3) |
Exposure spread | 1.83 stops |
Area used for calculation | 0.375 x 0.422 |
Camera settings | Exposure time: 6 ISO: 400 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 1.5 |
White | |
Screen photo |
|
Luminance | 26 cd/m2 |
Luminance spread | 1 cd/m2 (2 standard deviations) |
Exposure value | –0.03 stops (aim for –2 to –3) |
Exposure spread | 0.07 stops |
Area used for calculation | 0.375 x 0.422 |
Camera settings | Exposure time: 1/10 ISO: 400 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 1.5 |
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.