I started with a 75-300 and now have the 100-400L. If you can afford it, get the
100-400L! The image quality with a 100-400L is far superior to the 75-300 (&75-300 IS).
Plus, adding a teleconverter to a 75-300 disables auto-focus.
Rob
It's even better at 400mm that the 70-200mm f2.8 with x2 teleconverter
Felix
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