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In recent years, macro lenses in the standard range have tended to use internal focusing to maximize autofocus speed. In contrast, the new SIGMA 70mm F2.8 DG MACRO | Art lens is designed to put optical performance first, meeting the demanding image quality requirements that define the Art product line.
It delivers impressive resolution and incredible clarity for the medium telephoto range, well beyond what is expected of a macro lens.
The ironless DC motor further enhances image quality, while an optimized algorithm provides exceptionally smooth autofocus performance for a heavier powerful lens. Photography enthusiasts will surely remember a legendary, absolutely sharp macro lens - the SIGMA MACRO 70mm F2.8 EX DG Macro - and be pleased that it is now available in a new form; updated with the outstanding quality of the Art product line.
To achieve peak performance at any shooting distance, the lens features an extending, two-group floating focus mechanism. For optimal results at all shooting distances, this configuration minimizes aberrations. To minimize longitudinal chromatic aberrations, the optical system includes two FLD glass elements, two SLD glass elements, and one element with a high rate of anomalous partial dispersion and a high refractive index. In addition, two aspherical lens elements help to increase resolution at short acquisition distances. This optical system enables a razor-sharp focus area that contrasts with a bokeh area free of color streaks.
The focus-by-wire system eliminates the direct mechanical connection between the focus ring and focus drive. A newly developed ironless DC motor, controlled by the latest algorithm, regulates the focus quietly and at optimal speed. Manual focus is also available during autofocus, allowing the photographer to manually fine-tune focus by simply rotating the focus ring. In addition, the wide angle of rotation of the focus ring helps the photographer achieve the extremely precise focusing required for macro photography.
The Sony E-mount version of this lens is compatible with Sony mirrorless cameras and incorporates the same optical system as the SLR versions. The SIGMA MC-11 mount converter is not required and the lens supports in-camera features such as image stabilization and lens aberration correction. In addition, the lens is compatible with Sony's focus tracking AF, which is not available via the MC-11 port converter. SIGMA also plans to gradually offer Sony E-mount versions of all full-frame fixed focal lengths from 14mm to 135mm currently available in the Art product line.