Electromagnetic Diaphragm MechanismAn electromagnetic diaphragm mechanism in the lens barrel provides highly accurate electronic diaphragm or aperture blade control when using auto exposure during continuous shooting

from SW-2 ON until start of exposure Approx

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Internal focus design

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Sigma 85mm F1.4 DG HSM Art Full-Frame Sensor Lens for Sigma - 321956 Microphones & Mic Accessories Electromagnetic Diaphragm MechanismAn electromagnetic diaphragmPerfection Begins with Passion The Sigma 85mm 1. 4 DG HSM Art is the latest addition to the world renowned Sigma Global Vision Line. Designed and engineered for unparalleled image quality, the Sigma 85mm 1. 4 Art employs a completely new optical design and premium components. 2 FLD (performance equal to fluorite) glass elements and 1 element boasting a high rate of anomalous partial dispersion and high refraction achieve a class leading level of