It's a lens-by-lens sort of thing.
On a very few Zuiko lenses, including your 28mm 3.5 and the old 50mm Macro, the
body of the lens (with the filter ring/aperture ring/distance ring/et al) is
separate from the helicoid (to which the mount is attached). They are held
together by three internal screws. It's rare, but if these screws work loose
the front half of the lens will move in relation to the mount.
On most Zuiko lenses the body is part of the helicoid, so there's no way that
can happen. Some are "tighter" than others -- there's always _some_ play in
the helicoid -- but they _can_ "wear out", so that the guides move within their
tracks, or the threads of the helicoid get "sloppy". I don't think it really
_hurts_ anything -- they'll still take good photos, but....
Boris Grigorov wrote:
> Hi addicts,
> In the past week I bought two Zuiko lenses from that website and both came
> with the same problem. I would like to know how common that is.
> The 28/3.5 silvernose came in condition actually better than described. The
> seller seems very nice person, one of this people so nice, that you are
> actually very careful not to hurt their feelings, and if you accidently do
> it, the guilt stays on the back of your head to the rest of your life.
> I found that the metal ring that couples the lens with the mount moves. The
> screws are all the way in, I did not unwind any of them, the lens is not mine
> and do not want to dig. Just checked if they are fastened. Unfortunately,
> they were.
> What seems to be the problem? How big is it?
> What was interesting, the second lens (50/1.4) came with the same problem to
> a somewhat lesser degree, but it will definetly go back, because it was
> described as in exc+ condition with "clean/clear optics and perfect
> mechanics". After unwraping it, I had to clean tons of dust off of it and
> yes, as you suspected there was a considerable amount ( and I mean a lot...)
> of it inside too.
> Is this a common problem to the older Zuikos( not the dust, the moving ring)?
> My other two Zuiko lenses do not have the same problem. I also have 5 non
> Zuiko and non of them behaves like that.
> Thanks in advance.
> Boris
>
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