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Sigma 70-300mm f/4-5.6 APO DG Macro Autofocus Lens for Pentax K-Mount {58} at KEH Camera
Sigma 70-200mm f/2.8 EX DG APO OS HSM for Pentax 589109 B&H
Amazon.com : Sigma 70-300mm f/4-5.6 DG Macro Telephoto Zoom Lens for Pentax SLR Cameras : Camera Lenses : Electronics
Sigma 70-300mm F4-5.6 DG Macro Overview: Digital Photography Review