The Sigma 85mm 1.4 is the standard for portraiture lenses. Its distinctive focal length and large aperture give it great movement between uses, from portraits to everyday images. Designed for full frame sensors, the 85mm 1.4 will work with APS-C DSLRs with an effective increase in focal length. Featuring a multitude of Sigma technology to further ensure unmatched image quality, the 85mm 1.4 is equipped with a Hyper Sonic Motor (HSM) for quiet, accurate, high speed autofocusing, Super Multi-Layer Coating to reduce flare and ghosting, and a rear focusing system to minimize fluctuation of aberration caused by focusing. Truly designed to optimize available light, it has dedicated lens hoods to block out extraneous light, glass coating for better results from backlighting scenarios, and a 9 blade diaphragm for great background effects