The zoom lock works well, as does the AF/MF switch

I have used it for both and recommend a very slow zoom in or zoom out

The most important aspect that cannot be corrected is the lens' optical resolution seems to be where Sony's claims come false and short and way behind in particular to excelent Canon zoom

The zoom is super smooth, but also stiff enough to stay still.

The Zoom itself is very smooth and quick

There is an AF/MF toggle as well as a zoom lock on the lens body

By far the sharpest zoom lens I've ever used and very versatile in it focal length and constant f2.8 aperture

The zoom is super smooth, but also stiff enough to stay still.

The zoom works better for stills than it does for video