Kenko 1.4x Teleplus Pro 300 DGX teleconverter is designed specifically for prime telephoto lenses of 100mm or higher. The Teleplus Pro 300 extends your lens reach by x1.4 and exposure magnification is increased by 2x. It is chassis with precision quality multi-coated optical glass to improve light transmission and prevent reflections. It also maintains autofocus and metering while reducing light by one EV stop. Full AF operation is possible with lenses having a maximum aperture of F/4 or brighter. The converter is versatile allowing use with telephoto and prime lenses.
Not recommended for zoom lenses with a beginning range under 50mm.