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Message: <blockquote data-quote="Rob Chace" data-source="post: 1338616" data-attributes="member: 8711">Having used both, i would say that the Nikon TC-14e is optically better than the Kenko pro 300. But on the other hand the Kenko can be had for half the price of the Nikon! I had to sell the Kenko & get the Nikon in order to solve a bizarre metering problem when used between a D2x & Sigma 500 f4.5 (Andy Bright had the same problem).That all said, i did notice an appreciable difference in performance & image quality when using the Nikon. Rob</blockquote>