Fotodiox DLX Stretch Lens Mount Adapter - Pentax K Mount (PK) SLR Lens – Fotodiox, Inc. USA
CLUBMAN Wide Angle Pentax Fit Lens 28 Mm F/2.8 MACRO Full Frame Pentax K-1 and Other Bodies. - Etsy
Venus Optics' 100mm F2.8 Ultra Macro lens is now available with Pentax K mount, new stepless EF mount version also available: Digital Photography Review
EXC++ SUMMATEC P-MC MACRO ZOOM 70-210mm f/4.5 LENS FOR PENTAX K MOUNT+ – RecycledPhoto