Buy from Amazon.com : http://fave.co/1BPoEG7 <br /><br />Tamron AF 28-80mm f/3.5-5.6 Aspherical Lens for Pentax Digital SLR Cameras<br /><br />Product Description : <br />The Tamron AF28-80mm f35-f56 is a standard zoom lens with a wide to medium telephoto range of 28-80mm <br />By using aspherical elements in the front optical group <br />They also used strong engineered plastic for the barrel making the total lens body only 84 ounces <br />The use of aspherical elements in the front group reduces the number of elements required <br />A standard zoom lens from a wide 28mm to a medium telephoto range of 80mm
