Another alternative for extending your lens reach, the 1.6x Tele attaches quickly to the front of a lens and shifts the focal length in the telephoto direction. Unlike internal or external tele-extenders, the 1.6x Tele requires no exposure compensation.
•Add the 1.6x Tele-Converter to a 15 x 8 f/1.7-2.0 lens, and you alter its working focal length from 8-120mm to 120-192mm. (Vignetting occurs at focal lengths shorter than 120mm.) Combine this with a zooms built-in 2x extender, and you have the greatest possible reach - with full zoom-through capabilities and no additional light loss.
•For example, engaging the internal 2x extender converts an 8-120mm f/1.7 zoom into a 16-240mm f/3.4 zoom lens with a two-stop loss of light. Attach the 1.6x Tele-Converter, and the resulting focal length range would be an astounding 26-384mm with the same 3.4 f-stop.
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