The Evolution of the Pentax K-mount - Articles and Tips | PentaxForums.com (Mobile)
Amazon.com : NEEWER Lens Mount Adapter Manual Focus Ring Compatible with Pentax K Mount Lens to Sony E Mount Camera Including Alpha 1 A9 A7 A7C A7R A7S A6600 A6400 A5000 NEX-7
MonsterAdapter LA-KE1 review: Get Eye AF with your Pentax lenses on Sony E- mount: Digital Photography Review