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Sigma halts production of Pentax K mount lenses to put its focus on mirrorless: Digital Photography Review
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Sigma 18-300mm f/3.5-6.3 DC MACRO OS HSM Contemporary Lens with Sigma AML72-01 Close-Up Lens for Pentax K Mount - Walmart.com
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Amazon.com : Sigma 70-300mm f/4-5.6 DG APO Macro Telephoto Zoom Lens for Pentax and Samsung SLR Cameras : Camera Lenses : Electronics
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Sigma Announces Lens Compatibility Issues with K-1 - Third-Party Announcements | PentaxForums.com (Mobile)
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