Carl Zeiss produces two macro lenses in its ZF series: the 50mm and the 100mm. The 100mm f/2 model is available in the Nikon F-mount, the Pentax/Samsung K-mount and the M42 screw mount.The 100mm f/2 is a full-frame lens, built to ''old-school'' specifications that guarantee compatibility with older camera bodies. On a sub-frame digital sensor body, the lens will have an effective field of view of 150mm. The lens takes 67mm filters, and comes with a bowl-style metal lens hood. Read the whole review here.