The pentax 560mm f56 hd da ed aw lens is a super telephoto lens specially designed for use with the pentax k mount lenses and features a newly developed high grade multi layer lens coating to deliver clear well defined images of distant subjects when mounted on a pentax k mount digital camera body this super telephoto lens offers an equivalent focal length of approximately 859mm in the 35mm format the weather resistant construction includes 29 special seals to effectively prevent the intrus