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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 halts production of Pentax K mount lenses to put its focus on mirrorless: Digital Photography Review
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Sigma Lens Announces Compatibility Issues With Pentax K-1 | ePHOTOzine
Bad news for Pentax users: Sigma to end production of Pentax K-mount lenses | Digital Camera World
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Sigma DC 55-200mm F4-5.6 Lens Reviews - Sigma Lenses - Pentax Lens Review Database
