Thanks for help and suggestions. Still undecided. Used the 100-300 this morning in fair to reasonable light but still needed highish ISO to achieve the sort of shutter speeds I felt I could happily hand hold at but I still think some shots suffered from camera shake to a degree. Best option, of course, would be to keep the 100-300 for good light or occasions where support is available and get a lighter lens for winter dog walks. As Chris says, using a lens which does everything internally and stays the same length throughout is very nice. Looks like the 70-300 IS can produce the goods though.....
Fortunately, I still like the camera!
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