This is a dedicated APO teleconverter that can be mounted between select lenses and the camera body to increase the focal length. The multi layer coating reduces flare and ghost, which is a common problem with digital cameras. The device demonstrates best performance with DG series lenses. It also offers maximum photography magnification by 2x, without any variation in the minimum focusing distance. Compact and lightweight, this teleconverter converts your lenses into longer focal-length lenses, so you don't have to do a lot of unnecessary footwork.