It’s highly unlikely that Nikon will ever make another F-mount teleconverter, so this 2.0x version is probably the last in the line for Nikon cameras with compatible F-mount Nikon telephoto lenses. Unlike the newer Z-system teleconverters, it’s primarily designed for DSLRs but can also be used on Z-mount mirrorless cameras via an FTZ or FTZ II mount adapter. And it remains one of the best teleconverters on the market. As a 2x teleconverter, it doubles the focal length of the attached lens, with a reduction of 2 f/stops, so a Nikon AF-S 70-200mm f/2.8E FL ED VR lens effectively becomes a 140-400mm f/5.6 super-telephoto zoom.
