? Three aspherical lens elements minimize spherical aberration, astigmatism and sagittal comma flare
? Use of two SLD (Special Low Dispersion) elements results in excellent correction of chromatic aberration (the propensity of different colors of light to focus before and after the film plane)
? DF (dual focus) mechanism is incorporated, making it easy to hold the lens during AF while providing a wide focus ring for easy manual focus
? Non-rotating lens front allows the use of a flower shaped "Perfect Hood" and makes employing polarizing filters a snap