Lens construction: 16 elements in 11 groups, with 5 FLD and 4 aspherical lens elements Inner zoom Inner focus system Compatible with high-speed autofocus Stepping Motor Compatible with front filter (Diameter 72mm) Compatible with Lens Aberration Correction Function available on supported cameras only. Available corrections and auto correction functionality may vary depending on the camera model On cameras where lens aberration correction is controlled with 'ON' or 'OFF' in the camera menu, please set all aberration correction functions to 'ON' (Auto) Support for DMF and AF+MF Super Multi-Layer Coating Focus Mode switch Petal-type lens hood (LH756-01) Mount with dust and splash-resistant structure Designed to minimize flare and ghosting 9-blade rounded diaphragm High-precision, durable brass bayonet mount Made in Japan craftsmanship Every single lens is evaluated with SIGMA's proprietary MTF measuring system