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how big of an aperture do you need? you could throw a 500 on the 5d and roll with a telezoom on the 40d.
What about the sigma 120-300 f/2.8 on a 1.4xTC? This will be closer to L glass quality
or if you don't need that fast and want more reach, the sigma 120-400 f/4.5-5.6. This wont be close, but its only a grand.
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