This is a nearly perfect macro lens. With a completely new optical design, it is significantly sharper than its F-mount counterpart. The performance is already excellent at maximum aperture, distortion is absent, and vignetting is almost unnoticeable. Focusing is fast thanks to dual STM autofocus motors that move two groups of lenses and the 4.5 stops of vibration reduction make it easy to shoot handheld. The lens offers a short minimum focusing distance of 0.29m and includes a limiter switch to reduce the working range to a maximum of 0.5m. Finally, the lens is weather sealed for use in adverse conditions.