Sounds like the zoom guides have broken - happened to me with a 35-80
about 30 years back. Went back to Tamron for a warranty fix.
Seems a trip to the shop is called for - good luck.
Piers
On 04/02/2012, Wiliam Wagenaar <wiliam@xxxxxxxxx> wrote:
> Sorry Moose,
>
> I believe that focusing is 100% electronically, but zooming is mechanical.
> Even works when lens is disconnected from the body. What's wrong with the
> lens? No idea!
>
> Mechanical Wiliam
>
> -----Original Message-----
> From: Moose [mailto:olymoose@xxxxxxxxx]
> Sent: zaterdag 4 februari 2012 19:21
> To: Olympus Camera Discussion
> Subject: Re: [OM] trouble with my 50-200
>
> On 2/4/2012 7:06 AM, marc simon wrote:
>> Hi, all,
>> bad luck this morning at one moment my Zuiko ED 50-200 doesn't want to
>> zoom anymore:it looks like there is something "non-functioning" in the
>> linkage between the zoom ring and the optic. With some tweaking I could
>> manually extend the lens, like a one-ring zoom, and when I look at the
>> data the focal lens looks correct, and the autofocus still works...
>> So it looks like some mechanical linkage is not functioning anymore.
>
> I can't believe that is any mechanical function. Everything is electrical.
> There are a couple of other brands that
> accommodate their old MF lenses with mechanical connections.
>
> First thing to do is clean the contacts on lens and body.
>
>> ... It was cold this morning, but the lens doesn't suffer any shock...
>
> Perfect situation for a tiny bit of condensation to mess up a contact that
> was already a little dirty.
>
> The Tamron lenses on my Canons very occasionally cease to AF properly,
> busily and noisily hunting back and forth. Sounds
> like something terrible has happened. If it hasn't happened for months, it
> often takes me a moment to remember what it
> is. A quick wipe of contacts with my shirt or other piece of cloth puts
> things right. Then I try to remember to do a
> better job when back out of the field.
>
> Cleanliness Is Next to Function Moose
>
> --
> What if the Hokey Pokey *IS* what it's all about?
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