It is definitely a 180 f/2, not 2.8 (I own both). Would you mind writing me
off-list with your phone number? I'll give you a call and probably ship you
the lens to look at.
Tom
> Sorry for jumping in late here, but this is a 180mm f/2.0? Looking at the
> parts pages, I see that the distance ring is really a cam -- it would
really
> be unusual for it to be able to turn without changing _something_.
>
> I've only worked on a few, but I've made some notes on disassembly -- if
> you'd like I'll pass them on.
>
> Now the 180mm f/2.8, on the other hand, is a more "traditional" design --
the
> focusing ring turns a helicoid that unscrews. If the set screws have
worked
> loose, it would perform like you've described -- slipping a little, then
> grabbing and slipping more.
>
>
>
> Tom Scales wrote:
>
> > No, it's not focusing until it catches. So it slips 1/4 inch, then it
> > catches and focuses. Then it 'stutters' where it focuses/doesn't focus.
> >
> > Clearly a real problem.
> >
> > Gotta go in.
> >
> > Tom
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