Pentax HD DA 55-300mm f/4.5-6.3 ED PLM WR RE Lens Short minimum focusing distance of 095m PENTAXs first K-mount with electromagnetic diaphragm control system for a quiet sound operation during movie recording Diaphragm blades: 9.Rear focus system and PLM (pulse motor), direct drive lead screw system for quite zoom a High-speed AF Compact telephoto zoom lens thanks to its collapsible structure Weather-resistant construction ED lens elements for brilliant sharpness and saturated colors HD coating to optimize light transmittance and minimize reflection Quick-Shift Focus System to instantly change the AF mode to MF by twisting the focus ring SP (Super Protect) Coating applied to the front surface of the lens to effectively repel water and grease Rounded diaphragm to produce a beautiful bokeh