• FLD ("F" Low Dispersion) glass and SLD glass have been thoroughly corrected for magnification chromatic aberrations around the screen. In addition, lens power placement corrects axis chromatic aberration. No color bleeding, high definition image quality in a variety of shooting areas, providing sharp and contrast • The internal mechanism is equipped with an ultrasonic motor HSM (Hyper Sonic Motor) for faster AF speed and silent. Improved AF algorithms for smoother AF After focusing the focus, you can also get a full time manual that can fine tune the focus • Adopts a super multi-layer coating to reduce flare and ghosting and achieve high contrast images even when shooting in backlight • Nikon F-Mount