Contrast ratio | 221:1 |
---|---|
Monitor model | |
Submitted | 02 Feb 2011 10:09 CET, by 84.25.*.* |
Camera model | Nikon D40 |
Processing remarks | Note: image file 1: suggested exposure time: 6.0 s (Set EV to +0.3) |
Black | |
Screen photo |
|
Luminance | 0.1 cd/m2 |
Luminance spread | 0.03 cd/m2 (2 standard deviations) |
Exposure value | –3.77 stops (aim for –2 to –3) |
Exposure spread | 0.5 stops |
Area used for calculation | 0.5 x 0.563 |
Camera settings | Exposure time: 2.5 ISO: 400 F-number: 4 Focal length: 36 mm (35 mm equivalent) Exposure compensation: -1 |
White | |
Screen photo |
|
Luminance | 22 cd/m2 |
Luminance spread | 17 cd/m2 (2 standard deviations) |
Exposure value | –4.27 stops (aim for –2 to –3) |
Exposure spread | 1.14 stops |
Area used for calculation | 0.5 x 0.563 |
Camera settings | Exposure time: 1/125 ISO: 400 F-number: 4 Focal length: 36 mm (35 mm equivalent) Exposure compensation: -1 |
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.