| Contrast ratio | 19686:1 |
|---|---|
| Monitor model | Compaq TFT5030 |
| Submitted | 29 Jan 2010 23:15 CET, by 83.83.*.* |
| Camera model | Sony DSLR-A100 |
| Processing remarks | Warning: image file 1: Underexposed. Please increase the shutter time. |
| Black | |
| Screen photo |
|
| Luminance | 0 cd/m2 |
| Luminance spread | 0.01 cd/m2 (2 standard deviations) |
| Exposure value | –12.81 stops (aim for –2 to –3) |
| Exposure spread | 1.75 stops |
| Area used for calculation | 0.381 x 0.428 |
| Camera settings | Exposure time: 1/13 ISO: 400 F-number: 3.5 Focal length: 27.4 mm (35 mm equivalent) Exposure compensation: 0.3 |
| White | |
| Screen photo |
|
| Luminance | 93 cd/m2 |
| Luminance spread | 6 cd/m2 (2 standard deviations) |
| Exposure value | –1.81 stops (aim for –2 to –3) |
| Exposure spread | 0.09 stops |
| Area used for calculation | 0.381 x 0.428 |
| Camera settings | Exposure time: 1/125 ISO: 400 F-number: 3.5 Focal length: 27.4 mm (35 mm equivalent) Exposure compensation: 0.7 |
![[open image]](upload/cr009/02380a.jpg){kind=link}
![[open image]](upload/cr009/02380b.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.