Ricoh Unveils a New 100mm f/2.8 Macro Lens for Pentax DSLRs | PetaPixel
Rent a Pentax 100mm f/2.8 Macro smcP-D-FA at CameraLensRentals.com
SMC Pentax-F 100mm F2.8 Macro Reviews - F Prime Lenses - Pentax Lens Reviews & Lens Database
SMC Pentax-FA 100mm F2.8 Macro Reviews - FA Prime Lenses - Pentax Lens Reviews & Lens Database
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
Leaked images show off Pentax's new HD Pentax-D FA 100mm F2.8 Macro lens: Digital Photography Review