Bower 2x DGII Teleconverter with 7 Elements for Nikon F

Add some versatility to your existing Nikon F-mount lens collection with this 2x DGII Teleconverter from Bower, which contains 7 elements to ensure sharp imagery. This teleconverter utilizes multi-coated optics that will double the effective focal length of your F lens, for example it will convert an 85mm lens to 170mm. This doubling effect has a light loss of about 2 stops, meaning an f/1.4 lens will become an f/2.8 lens. Additionally, this teleconverter offers full communication between the lens and camera to enables autofocus and other electronically controlled functions.