Pentax has released details on the new line of high-end digital SLR lenses that the company announced at Photokina in September 2006. The smc Pentax-DA* series will debut in spring 2007 with a wide-angle zoom and a telephoto zoom. Both weatherproof lenses have Pentax KAF2 mounts and are designed to work exclusively with Pentax digital SLRs. 
The smc Pentax-DA* 16mm-50mm F2.8 ED AL[IF]SDM has a 35mm-equivalent focal-length range of 24.5mm to 76.5mm and a 0.3-meter minimum focus distance. It incorporates two ED (extra-low dispersion) elements and three aspherical elements to reduce optical flaws. In addition, its front element has Pentax's SP coating to repel dust, water, and grease. Read the whole article here