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mmm, a few options. My personal advice - go the 300mm f4 and the 1.4x teleconvertor. The main issue you're going to see is that this will push the minimum aperture to f5.6, meaning less light for the AF sensors, so AF will be slower and less accurate. Been there, done that. Don't even think of the 2x TC, cos, unless you're using a 1 series body, you'll lose AF past f5.6. Good ole Canon crippling its camera bodies deliberately. Notice Nikon doesn't do this - pretty much all of the bodies from the consumer to pro use the same AF modules.
Dave
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