kaos wrote:The sensor, however, seems to be 16:9 widescreen, so you can increase the aspect ratio to that point without loosing any vertical resolution. Go any further and the camera will start discarding information top and bottom to achieve the asked for aspect ratio, and as a result zooming in.
This means that to take full advantage of the sensor's resolution, you should use it's native aspect ratio, 16:9.
There is something wrong here, because the sensor aspect ratio is not native 16:9 (1.778:1 ) it is much more square than that. The imaging area is 3.67 x 2.74 mm and each of the 2592 x 1944 pixels is square (1.4 x 1.4 um). That gives a full sensor aspect ratio of 1.342:1 which is approximately a 4:3 aspect.
I have a suspicion that the provided software is always using the sensor in 1920x1080 video mode even when capturing stills, and then upscaling or rescaling, instead of using the full native sensor resolution for stills.
From OV5647 chip specs at http://www.ovt.com/download_document.ph ... ensorid=66
RPi camera sensor image area: 3.6736 x 2.7384 mm
and diagonal: 4.582 mm
Number of effective pixels 2592 x 1944 (Total: 5038848 )
Pixel pitch in µm: 1.4 x 1.4