Thanks Alan. As far as the 135/150 go,i'll leave them alone.I like the way they focus.I'll see what i can do with the 70- 210.
Dave
> >By focusing rubber,do you mean the long knurly
rotating piece.If so how do
> >you remove it
> >to get to the
> >screws.
>
> The whole focus ring is covered by a large piece of rubber. You only need to
> peel off the edge near the distance scale to access those screws. You might
> need a tiny slot screwdriver for the job because the rubber is quite stiff.
