The kenko teleplus mc7 dgx 2x teleconverter is an easy and inexpensive way to increase the abilities of your lens without the expense of purchasing and carrying additional telephoto lenses it features genuine gate array ic integrated circuitry meaning that the kenko teleplus mc7 dgx 2x teleconverter maintains communication between the camera body and lens in the same way an original manufacturers converter would whats more as a dgx converter it will also display the effective focal length