The HD Pentax-DA 20-40mm f/2.8-4 ED Limited DC WR is a weather-resistant wide zoom lens designed for Pentax K-mount digital cameras. The first zoom lens in the acclaimed Limited Lens series, this zoom lens features an in-lens AF driving motor and offers a 35mm equivalent focal range of 30.5-61.5mm. The Pentax 20-40mm f/2.8-4 lens has been treated with the PENTAX-developed HD coating, a high-grade, multi-layer coating that reduces reflection in the visible light spectrum to less than 50% of that of conventional multi-layer coatings. It also incorporates an ED (Extra-low Dispersion) glass and a super-low-dispersion glass element in its optical formula. Other highlights include a quick-shift focus system, Super Protect coating and an iris diaphragm with rounded blades. Available in black and silver, the HD Pentax-DA 20-40mm f/2.8-4 ED Limited DC WR carries an RRP of £849.99.