Inner focus system Compatible with high-speed autofocus Stepping motor Compatible with lens aberration correction Support DMF and AF+MF Super Multi-Layer Coating Aperture ring Focus Mode switch Round-type lens hood (LH576-02) Magnetic metal lens cap (LCF55-01M) Mount with dust and splash resistant structure Compatible with SIGMA USB DOCK UD-11 Designed to minimize flare and ghosting Every single lens undergoes SIGMA's proprietary MTF measuring system 9-blade rounded diaphragm High-precision, durable brass bayonet mount Made in Japan craftsmanship