It does so have to, it just doesn't want to... Mark Roberts wrote: > Dario Bonazza wrote: > >> Hi all, >> >> I've been asked this question, but couldn't answer it. What happens by >> matching a DA* 300mm AF lens (or any other SDM lens) with the AF 1.7X >> converter? Do both AF devices (the SDM one in the lens and the screwdriver >> type in the adapter) start & try to autofocus? >> > > That couldn't happen because the 1.7xAF converter doesn't have to > electrical contacts necessary for SDM focusing. > >
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