Query regarding Tokina's Focus Clutch Mechanism

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I finally bought the cheap cheap Tokina 28-70 ProSV on offer...
so far so good...

just got one question, this one got the Tokina's Focus Clutch mechanism to toggle btw manual focus and autofocus....

it also has a switch to toggle btw manual and auto...

my question are :

1. is it necessary to switch the tiny switch before pulling the clutch mechanism to and fro

2. while in autofocus mode, will turning the focusing ring damage the lens autofocus mechanism

3. i can only engage the clutch at the previous focus length setting instead of at the extreme focus ends as stated in the manual.. is there any problem with it?


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