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"RE: D300 mysteriously died"
Hi Roger,Welcome to Nikonians!Sorry to hear of the problem with your D300.The Nikon TC-14E II, TC-17E II, TC-20E II and III are fully compatible with all Nikon AF-S and AF-I Telephoto lenses including your 300mm f/2.8D ED IF AF-I. If the problem started when you were using the Kenko TC, I would not be using it with another camera before having the TC checked out or repaired.