Alan.
I have this lens too and it seems to me that the focus is a bit loose too.I palm hold 
my
zooms and it 
would take nothing at all to move focus. Someone mentioned a few years back there were
several 
small screws on the lens that could be tightened.The only ones i saw were up close to 
the
k mount 
end,3 screws i think,but i'm not sure they are the ones.I tried to tighten with a small
jewlers 
screwdriver but nothing moved.May be they are as tight as should be.
I only use the A 70-210 f4 now on a monopod or for macro shots.
To big of a pita for hand holding now.

Dave  

                                        > Zoom creeping is normal for the SMC PENTAX-
A 70-210/4 and there is nothing 
> can be done.
> 
> Yours regards,
> Alan Chan
> http://www.pbase.com/wlachan
> 
> >Could anybody could tell me whether there is anything I can do to sort this
> >out myself or whether is is a job for the repair shop.
> 
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