• Sigma Announce Three New Lenses

    by
    Harriet Weston
    Published on 10th January 2012 11:53 AM
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    Sigma 19mm F2.8 EX DN
    The Sigma Corporation is pleased to announce the new Sigma 19mm F2.8 EX DN. This high-performance wide angle lens is designed exclusively for mirrorless interchangeable lens
    cameras and has the equivalent angle of view as a 38mm (35mm equivalent focal length) on the Micro Four Thirds systems and 28.5mm (35mm equivalent focal length) on the E-mount system.
    Three glass mold aspherical lenses provide excellent correction for distortion, color aberration and field curvature. The inner focusing system corrects the fluctuation of aberration to maintain image quality regardless of the focus distance. Sigma’s Super Multi-Layer Coating reduces flare and ghosting and provides sharp and high contrast images even at the maximum aperture. The superior telecentric optical design improves image quality throughout the frame. This lens benefits from a newly developed linear AF motor which moves the lens elements directly without the need for gears or the drive of other mechanical parts. This system ensures accurate and quiet autofocusing, making the lens suitable for
    video recording as well as still photos.

    The lens features a rounded 7 blade diaphragm creating an attractive blur to the out of focus areas of the image. This Sigma 19mm F2.8 EX DN has a minimum focusing distance of 20cm/7.9in and a maximum magnification ratio of 1:7.4.




    Sigma 30mm F2.8 EX DN
    The Sigma Corporation is pleased to announce the new Sigma 30mm F2.8 EX DN.
    This high-performance standard lens is designed exclusively for mirrorless interchangeable lens cameras and has the equivalent angle of view as a 60mm lens (35mm equivalent focal length) on the Micro Four Thirds systems and 45mm (35mm equivalent focal length) on the E-mount system.

    Two glass mold aspherical lenses, including a double-sided aspherical lens, provide excellent correction for all types of aberration. The inner focusing system corrects the fluctuation of aberration to maintain image quality regardless of the focal distance. Sigma’s Super Multi-Layer Coating reduces flare and ghosting as well as providing sharp and high contrast images even at the maximum aperture. The superior telecentric optical design improves image quality throughout the frame. The optical design also allows the lens to be compact and lightweight. This lens benefits from a newly developed linear AF motor which moves the lens elements directly without the need for gears or the drive of other mechanical parts. This system ensures accurate and quiet autofocusing, making the lens suitable for video recording aswell as still photos.

    The lens features a rounded 7 blade diaphragm creating an attractive blur to the out of focus areas of the image. This Sigma 30mm F2.8 EX DN has a minimum focusing distance of 30cm/11.8in and a maximum magnification ratio of 1:8.1.




    Sigma APO Macro 180mm F2.8 EX DG OS HSM
    The Sigma Corporation is pleased to announce the new Sigma APO Macro 180mm F2.8 EX DG OS HSM.
    This is the world’s first 180mm macro lens incorporating a magnification ratio of 1:1 and a large maximum aperture of F2.8. It benefits from Sigma’s original Optical Stabiliser function and the wide F2.8 aperture allows faster shutter speeds for narrow depth of field, enabling photographers to emphasize the subject. Three FLD (“F” Low Dispersion) glass elements provide excellent correction for colour aberrations. This lens incorporates Sigma’s floating inner focusing system which minimises aberrations that occur as shooting distances change and enables stable rendering of the image from infinity to 1:1 magnification. The Super Multi-Layer Coating reduces flare and ghosting and provides sharp and high contrast images even at the maximum aperture.

    Equipped with Sigma’s own propriety OS (Optical Stabiliser) system, this lens offers the use of shutter speeds approximately 4 stops slower than would otherwise be possible*, enabling handheld close-up photography. The incorporation of HSM (Hyper Sonic Motor) ensures quiet and high speed autofocus as well as full-time manual focus capability. This lens has a rounded 9 blade diaphragm creating an attractive blur to the out of focus areas of the image. At 1:1 magnification, this lens has a focusing distance of 47cm/18.5in which is a greater working distance than shorter focal length macro lenses. This is advantageous when taking pictures of highly sensitive subjects such as butterflies and insects.

    Attaching Sigma’s optional Tele Converter’s allows photographers to shoot with an even greater working distance or with a magnification ratio larger than 1:1.