> I've been wondering about FTM on Canon 28-70/2.8 for a while now. I don't
> use FTM that much, only rarely. I'm a bit concern when rotating the manual
> focus ring while on AI Servo. If you rotate the focus ring, usually the lens
> will try to re-focus (on a moving object). Would it damage the lens?

No it won't... I seem to recall that the only lenses that can be FTM'ed are those with 
the combination rear element focusing and ring-type USM motor.

> The manual advise to rotate the manual focus ring when autofocus is
> finished. On a moving object and AI Servo, the autofocus is basically never
> finished. Should one avoid using FTM on this mode?

Yes, since the manual adjustment is canceled virtually instantly...

Snorre


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