Amazon.com : Venus Laowa 100mm f/2.8 Manual Aperture 2X Ultra Macro APO Lens for Pentax K : Electronics
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
Laowa 100mm f/2.8 2:1 Ultra Macro APO Review | Photography Blog
Laowa 100mm f/2.8 2x Ultra Macro APO - LAOWA Camera Lenses
Venus Laowa 100mm f/2.8 Manual Aperture 2x Ultra Macro APO Lens for Pentax K VE10028PK