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Sigma 120-300 f2.8
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hi all looking for some advice here on a sigma 120-300 f2.8 , i have started to shoot a bit of sport and do bird photography and have a canon 100-400mm lens at the minute i was wondering is there any one out there using a sigma 120-300 the os version with the 2.8 and a with a tc 1.4 would have f4 will b used on a canon 1d iii any advice would be greatly appreciated :D
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