Dave I reckon the Ed 80is the go.As for the Sigma with converters I find 1.4x much better then 2x when using my telephoto lenses. I will probably use my 1dx 2 with a 600mm lens and 1.4x converter.That way I can just jump outside and take a handheld shot every 15 minutes or so. I,m thinking it will be showers up here.
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