The Tamron SP 10-24mm F/3.5-4.5 DI-II is a wide zoom lens used in DSLRs with APS-C size sensors. Its zoom range is found to be the largest in its class.This lens for Pentax digital SLR camera provides 35mm equivalent coverage from 16mm ultra-wide to 37mm semi-wide, a remarkable 2.4X zoom ratioThis zoom lens for pentax has a maximum coverage of over 108 degree, which is  perfect solution for expanding your visual horizonsThese lenses feature 12 elements in 9 groupsThe design of lens ensures enhanced peripheral illumination