The manual focus ring on my zoom EF-S 18-135 lens does not seem to indulge in the optics to change orientation

The manual focus ring on my Canon 18-135mm EF-S is free to turn if the switch is in the position AF or MF. It does not change the focus. Auto focus works well. Another objective of zoom seems to allow a manual focus without difficulty. What have I forgotten?

What is the new version of the STM or the old version non - STM of the 18-135?  It will make a difference in the operation of the focus ring.

If this is the version non - STM (original 18-135), then you should _not_ attempt to focus of the lens manually with the switch auto focus mode AF.

If it's the version of the STM (new 18-135) then you can rotate the focus ring if the switch of autofocus is AF or MF (but it wont focus unless the unit is on and not asleep.)  For example press the shutter button halfway to reactivate and work the focus ring).

Most of the USM goals (there is no version of the 18-135 USM) allow the ring to be returned if the device is in AF or MF mode.  The ring is basically a like a sweet clutch and there a few deliberately built sliding- and these rings of just development will keep turns and turns... There is no hard stop for the ring.

Tags: Canon Camera

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