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17-50 is not wide, it is the equivalent of a mid-range FX zoom. The Tokina 11-16 is apparently a nice optic but for me its range is kind of limiting. If I am to carry a heavy bulky zoom I might as well keep it on the camera more of the time, with 11-16 you are almost carrying a prime. For me the Nikon 10-24 is the most versatile WA zoom, though it is a bit outside your range even used. If you do not need large aperture the Sigma 10-20 MkI is an insane value and a great optic.