The sigma 8 16mm f45 56 dc hsm lens is an ultra wide zoom lens with a minimum focal length of 8mm designed specifically for aps c size image sensors where it gives focal lengths equivalent to 12 24mm 35mm format and an angle of view of approximately 1145 757 degrees the sigma 8 16mm features 4 low dispersion glass elements to compensate for colour aberration while one hybrid aspherical lens and two glass mould elements give excellent correction for distortion and astigmatism the supe