Quote:
Originally Posted by BrokenVert
2X TC only works properly with the 5D and 1D lines. With My MK i 7D a 2x TC wont ever focus lock, it just constantly hunts.
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Actually, the latest 1D, 5D and 7D bodies now all have the same AF system, with minor differences in the number AF points, X-points, etc.. The 1D X will manhandle a 2X TC better because of its higher voltage battery. Mark's Siggy is f/2.8, so a 2x TC will only change that to f/5.6, which the last two or three generations of bodies have been able to manage. However, that doesn't mean that its response will not slow down.
Dave