The Zeiss 100 Macro Planar has for many years been considered the sharpest prime lens made, and is now available in Nikon mount. Ridiculously expensive, and worth it, the 100 is frequently used as a long landscape and portrait lens, as well as a Macro lens. In case you aren’t aware, this a a manual focus only lens, but D200 and higher bodies will adjust exposure and white balance automatically if you wish.