I think we are both saying the same things:  that bad bokeh is one of
the weaknesses of the 100-400, so if I shoot with that lens, there are
certain things to avoid.  On the other hand, you make a point that
choosing a more expensive lens with better bokeh would also solve the
problem.

The bokeh comparison that most interests me are these three:
  EF 400 f/5.6 L USM
  EF 100-400 f/4.5-5.6 L IS USM
  EF 400 f/4 DO IS USM

The "bright-ring" bokeh of the 100-400 can even be seen in the viewfinder
by defocussing an image of a distance point source of light (e.g. lamp).
Has anyone looked in the DO lens to see what happens in the same situation?

Cheers
Julian Loke
========================

If it (The 100-400 IS) works for Andy Rouse then it works for me (And it
does too :-)

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