Canon EF-S17-85mm f/4-5.6 IS USM Instructions Manual page 6

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Close-up Photography (Macro Photography)
The lens can focus as close as 0.35 m/1.2 ft for
close-ups (macro photography).
To focus at 0.35 m/1.2 ft, set the lens focus mode
switch to MF. Look through the viewfinder and
move your body forward or back to focus. Take
the shot when the subject is in focus.
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Zooming
To zoom, turn the lens' zoom ring.
Be sure to finish zooming before focusing.
Changing the zoom ring after focusing can affect
the focus.