SIGMA 100-400mm f/5.0-6.3: Nikon DX SLR (D40-D90, D3000-D7500) Talk Forum: Digital Photography Review
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Sigma 729955 100-400 mm F5-6.3 DG OS C Nikon Fitting HSM Lens - Black: Amazon.co.uk: Electronics & Photo
Sigma 400mm f/5.6 APO (manual focus) + 2x TC: my review.: Pentax SLR Talk Forum: Digital Photography Review
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