The pentax fit sigma 10 20mm f35 ex dc hsm lens is a super wide angle lens with maximum aperture of f35 throughout the entire zoom range it has two eld glass elements and one sld glass element which provide excellent correction of colour aberrations four aspherical lenses provide correction for distortion and allow its compact and lightweight construction it also features a hyper sonic motor which enables quiet and high speed auto focus the sigma 10 20mm f35 ex dc hsm lens is designed fo