Originally Posted by Tony Davies-Patrick
I'm not sure if it is possible to zoom without inducing shake/wobble using most manual zooms without an extrenal servo. Better to just use the zoom for obtaining a different frame position from a fixed point.
No, was talking about focussing not zooming. The 50-300 and 200-400 MF have no IF. The other effect of this is that when you put a hood on the lens the weight of it exerts downward pressure and so makes the focussing even heavier. I had a Leica 105-280 that had the same problem, otherwise a gorgeous lens.