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The Kenko Pro 300 1.4X DG is designed specifically for use with telephoto lenses of 100mm or above, working best with telephoto lenses of 200mm to 500mm. It will magnify the focal lens of any lens by 1.4 times, bringing things closer, with only one stop of light loss. The Pro 300 1.4X DG can be used with telephoto zoom lenses as well as prime lenses, but, due to their design, the optical design of the elements and light path is wide enough to avoid any vignetting.
Note: Manual focusing may be required depending on the lens used.