Here are the detailed specifications of the two upcoming Pentax lenses: HD PENTAX-D FA 15-30mm f/2.8 ED SDM WR  (rebadged Tamron SP 15-30mm f/2.8 Di USD) HD coating Lens construction: 18 elements in 13 groups Minimum focusing distance: 0.28 m Maximum magnification: 0.20 times Aperture blades: 9 WR lens Ultrasonic motor No filter thread (?) Weight: … Continue reading HD PENTAX-D FA 15-30mm f/2.8 ED SDM WR and HD PENTAX-D FA 28-105mm f/3.5-5.6 ED DC WR lens specifications