The sigma 200 500mm f28 ex dg telephoto zoom lens nikon fit is the perfect lens for creating amazing image expression with various types of photography including astrophotography portraits wildlife and sport inside the lens sld special low dispersion glass and three eld extraordinary low dispersion glass elements provide excellent correction for all type of aberrations the sigma 200 500mm f28 ex dg telephoto zoom lens also features super multi layer lens coating which reduces flare