Though many may not realize it, the Kenko K1.5 SHQ DG teleconverter is a powerful optic for macro photography.
An Example; the Tokina AT-X 100 PRO D 100mm f/2.8 macro lens
will focus as close as 11 inches. At that distance the lens has a life-sized reproduction ratio of 1:1. This means that if the subject is only half an inch long it will be half an inch long on the film or CCD. The K1.5x SHQ DG converts the lens into an equivalent 150mm lens with a reasonably bright equivalent f/4 aperture with the same 11 inch minimum focusing distance. Now at 11 inches the reproduction ratio is larger than life sized, 1:0.75, which enters the realm of MICRO photography!