> I bought my specimen of this lens from a gentleman
> who took very good care of his equipment, and there
> were no signs of damage to the lens. My lens has
> NEVER maintained focus throughout a zoom. Are you
> sure it's supposed to do so?
There is nothing wrong with this lens. A small amount
of focus shift during zooming is thought to be
tolerable by the manufacturer. This is clearly stated
in the manuals of the A, F and FA lenses which
recommend focusing zoom lenses after adjustment of the
focal lengths because of a slight focus shift. For my
part most zoom lenses that I have tried (including the
SMCM 80-200/4.5) show a slight focus shift (if you are
picky). This does not affect the optical quality of
those lenses but you have to be aware of this (do not
focus before adjusting the focal length).
Enjoy.
Alexander
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