I've been looking a particular Pentax macro lens that is said to have extremely high sharpness. It's a A 50mm f/2.8. It's got me to thinking about lens designs. A lot of Macro lenses have very high resolution. These lenses are usually in the f/2.8 to f/4 range, but there have been some very good one at the f/2 and f/2.5 mark as well. So my question is this: Do lens designers have the ability to make traditional, non macro, lenses spectacularly sharp but do so because they would have unpleasently high sharpness, or perhaps because there would be too great a difference in sharpness between apertures, or is there something "magical" about macro designs that allow for such high resolution values. Do lens designers limit gross resolution in order to achieve some sort of balanced lens design? PS: I use the terms resolution and sharpness pretty loosely here, but I think my general point in pretty clear.