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    80-400 VR or 300 f4 with 1.4tc?

    I have a Sigma 400mm F5.6 APO macro used on a D200 and mine is very sharp, even wide open. I cannot really comment on the AF, but it can track ducks motoring along on a pond, but Red Kites are a struggle. I mainly use mine for insects, and the IQ at close focus is excellent. The colour seems to...
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