As much of a joy as it is using manual lenses with my NEX-7, I would love to have the ease of autofocus in my near future. The only problem with getting a current native e-mount autofocus lens is they all employ the lesser Contrast Detect Auto Focus (CDAF, focus is found via contrast) rather than the more efficient and generally faster Phase Detect Auto Focus (PDAF, focus is found via distance tracking), the latter of which I am used to from previous cameras. Though in good light, CDAF is known to be accurate and fast, the scenarios where I would love to use it–focusing in low light and motion tracking–the system as a whole falters. It isn’t designed for focus tracking, and in low-light, there is no contrast to detect! This is put up beside PDAF, which all DSLRs use to some degree, and focusing on subjects in low light and in motion are a cinch.

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