Thanks all, for the valuable feedback. I wonder if I'm using the
right term - "softness." I mean something like resolving power. I
shoot a lot of birds, among other things, and I'm often bringing home
shots of large flocks of say Snow Geese, where you may have a few
thousand birds in the view, each with yellow bills, black wing tips,
etc, and I want absolutely as much clarity as possible on such
features. Similarly with feather detail on closer shots. I'm now
using an FD 400mm f/4.5, sometimes on a 1.4x or 2x extender, and this
is a pretty sharp lens. I want sharper though. And of course I want AF.
But the point about IS is well-taken - I'm sure it would make the
difference much of the time.
Ken
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