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Sigma 745101 150 - 600 mm F5 - 6.3 DG OS HSM Contemporary Canon Mount Lens, Black: Amazon.co.uk: Electronics & Photo
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Canon 100-400 II vs. Sigma 150-600 Sport for Wildlife/Nature: Some Early Speculations -- Canon Lenses in photography-on-the.net forums
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Re: MTF Comparison: Canon EF 100-400 f/4-5.6 II and Sigma 150-600mm f/5-6.3 Sport: Canon SLR Lens Talk Forum: Digital Photography Review
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