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- 'Gramps'
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Will the TC-20III work with the older 300mm f4 ED, i know the newer TC-14III doesn't (or at least Nikon states it will not work with it)
Yes it will, but Nikon say:-
Autofocus is available only with cameras that offer f/8 support. These include the D4/D4S, Df, D800/D800E, D810, D600/ D610, D750 and D7100.