Tamron 18 - 270mm wide angle focus problem
I have similar problem with the Sigma 18-250mm. There are just so much to calibrate PDAF on these superzoom lens. You basically need to calibrate EACH focal length at EACH focus distance. The upcoming Sigma USB lens dock should allow us to do just that.
Meanwhile, that zoom in AF, then zoom out to expose technique you mentioned worked out pretty decently for me.
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