I currently use an EF 70-300mm f/4-5.6 IS USM on my 20D and am not at all that happy with it. Maybe someone here could tell me if the EF 70-200mm f/4L USM would be a significant upgrade. I'm more worried about the reach, would a tele converter do well on this lens and if so which one. Bye the way I'm shooting birds with this set up.
Thanks in advance,
Brian






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