The CCamera direct viewfinder image shown on the N8 does not fill the whole screen; e.g. in landscape mode there are two unpainted areas on the left and right and the shown direct viewfinder image has the ratio 4:3.
When using the original N8 camera application there is the same behaviour, but there you can expand the viewfinder image to fullscreen with a two-finger gesture.
Is there a way to expand the direct viewfinder image to fullscreen? (the bitmap based viewfinder is much slower and thus is not a real alternative).