The Zeiss 30mm f/3.5 Fisheye-Distagon lens is for creative photography. Fisheye lenses are like ultra wide angle lenses with an interesting difference: straight lines only remain straight when they pass through the center of the picture. The closer they are to the edge, the more curved they will appear. The 180 degree angle of view and extreme depth of field of this design opens up new possibilities not possible with other lenses.
NOTE: The legendary Rollei SL66 camera's have been discontinued and, unfortunately, there are only a few lenses and accessories still available.