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| p.1 #4 · p.1 #4 · D7000 with Sigma 500mm f/4.5 EX DG APO HSM |
One thing to consider - and I do love my 300mm + 1.7x combo - is that the teleconverter combo that the 'monkey mentions pretty much maxes you out at ~500mm. I'm not very pleased with the results of the 2x converter on it, so I don't consider that a viable option.
If you can swing the 500mm, you'd have the option of slapping a 1.4x or 1.7x converter on there for an even longer lens.
If the "other birds" you shoot include songbirds... well, we always know you can never have enough reach for songbirds.
The 300 + teleconverter is definitely a cheaper option, though, and is really optically pretty darn good for the money.