Sigma 120-300 or alternative zoom?
I am after a zoom that covers the 100ish to 300ish range, to be used for sports and wildlife/birding (the latter perhaps with 1.4 or 2* TC attached). I have focal lengths up to 200 well covered, and could use my 70-200 f2.8 with a TC, but that slows the focussing speed down quite a lot when using AI servo. I also already have a 500mm prime. The lens would be mounted on a 1DsII.
My list of possibles are the sigma 120-300 f2.8, 100-300 f4, and the canon 100-400L. I'm not too bothered by IS - I can handhold the 500mm prime reasonably well, and if the light is too low, use a mono/tripod. I like the internal zoom and focus of the two sigma lenses, as it makes handling the lens much easier, and like the idea of a fast apeture for a nice bright view-finder, fast shutter speeds for sport and critical focussing. It would also give a 600mm f5.6 AF combo with a 2*TC, which appeals for birding. Downsides of the 120-300 are cost and weight when compared to the other two lenses, and I have read of focussing issues when used with 1 series bodies.
Any experience/views would be appreciated to help me choose. Thanks
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