Hi,
I am intrigued...
Do you mean that the camera optics has the capability of taking sharpest pictures when the camera is turned into macro mode? If so, can you direct me further where to read about this?
I have never used the macro mode when DS. On a Canon powershot S90 my experience of sharpest images is when the zoom between its widest (28mm equivalent, eliminating vignetting on a wide angle DS eyepiece would mean around 35mm equivalent) and somewhere around 2X zoom, meaning ~56mm equivalent, but I haven't tested sharpness using e.g. resolution charts.
/Tord