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Forum: Pentax SLR Lens Discussion
10-03-2017, 05:41 AM
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I haven't used the 16-50, but I do have (currently selling) the 50-135 (its "partner"). Image quality and max. aperture are upgrades but focus speed is MUCH slower -- the "new" focusing motor on the 18-135 is much faster than the old SDM. Forget about autofocus with things that move (without some creativity). Oddly enough, most people indicate a focus speed improvement if they convert it to screw drive although it gets a bit noisier. (Fortunately, my SDM is still working.)
That might be something you want to consider if you decide to purchase the 16-50 -- the conversion can apparently be done with older bodies.
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