SMC Pentax-M 100mm f2.8 used as a tube lens for extreme macro
Amazon.com : Pentax HD PENTAX-D FA Macro 100mm F2.8ED AW Macro Lens, dustproof, Weather-Resistant AW (All Weather) Construction, Black (20320) : Electronics
Pentax 100mm f/2.8 Macro Review: Great Quality in an Outdated Package | PetaPixel
Pentax-D FA 100mm f/2.8 Macro WR Lens Review | ePHOTOzine
Pentax 100mm f/2.8 D FA WR Review
SMC Pentax-A 100mm F2.8 Macro Reviews - A Prime Lenses - Pentax Lens Reviews & Lens Database
SMC Pentax-FA 100mm F2.8 Macro Reviews - FA Prime Lenses - Pentax Lens Reviews & Lens Database
Pentax HD Pentax-D FA Macro 100mm f/2.8 ED AW (Black) 20320 B&H
Pentax-D FA 100mm f/2.8 Macro WR Lens Review | ePHOTOzine
Pentax HD Pentax-D FA Macro 100mm f/2.8 ED AW (Silver) 20330 B&H
Pentax HD D FA Macro 100mm F2.8 ED AW Review | PCMag
Pentax 100mm f/2.8 SMC D-FA WR Macro review | Digital Camera World
Pentax 100mm f/2.8 SMC D-FA WR Macro review | Digital Camera World