Tamron 18-250mm f3.5-6.3 Di II Lens - Canon Fit.
Using manual focus on a Sony NEX-5n and a panasonic GH2.
When I zoom in to 250mm then focus then zoom out, the lens looses focus around 150mm and stays out of focus till 18mm.
If I then very gently push the zoom ring clockwise (still at 18mm) it...
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