Get sharp images with excellent contrast with the 15 elements in 13 groups lens construction of the Sigma 18 mm-200 mm F/3.5-6.3 camera lens. The two aspherical glass elements of this Sigma zoom lens provides distortion-free clear images. The two Special Low Dispersion glass elements of this Sigma camera lens reduce distortion and offer crisp and refined images. The 17.7 inches minimum focus distance of this Sigma zoom lens delivers outstanding close-up images. The Sigma 18 mm-200 mm F/3.5-6.3 lens has 7 aperture blades that produce exceptional out-of focus effects. Protect your Sigma camera lens from harsh environment with the 62 mm filter size.