EF70-200mm f4L, problem?

[Bowen]

I got a 70-200 f4 L last week but I haven't really played around with it much till today and I noticed something that I wasn't sure about.

I'm still new to the "white" lenses, so I thought I'd ask here before I take the lens back.

I noticed that when in MF mode the focusing ring will rotate beyond the "stoppers," or designated area.

[tiha]

It's OK. All FTM lenses do that. Lens focusing mechanism contains a clutch that disengages focusing ring during AF and when you turn it beyond distance scale.

[Mat Fitzsimmons]

Yep, perfectly normal.
Enjoy the lens ... great choice.

[Bowen]

Thanks for the replies. You made me much happier.

[CRE@TE]

It's designed to do that. It's so you don't damage it when you over rotate the ring.

[Calzinger]

What's the purpose of the AF "stopper" anyway? So it doesn't have to rotate all the way to the end and come back if it's hunting?

[tiha]

Yes. This switch allows you to chose between two closest focusing distances in order to reduce focusing time and to prevent hunting.