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Message: <blockquote data-quote="BeerBelly" data-source="post: 599839" data-attributes="member: 35439">If 300mm is enough for you then the 300 AF-S F4 sounds good. I would argue though that if you intend to use TCs, you might be better off using a lens that gets you those focal lengths natively. The TCs, while helpful, do present a hit on AF speed and image quality. So if you intend to use them most of the time and turn your lens into a semi-permanent 420/5.6, my suggestion would be to take a look at the Nikon 200-500 or one of the 150-600 zooms, because you will get faster AF and most likely better image quality from them. Now as far as the difference between the Nikon versions of the 1.4 TC...I can't help you much there because I haven't used any of them. I do recall reading that the newest ones do not physically fit on the old AF-D lenses.</blockquote>