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20Mm F1.4 DG HSM Art

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20Mm F1.4 DG HSM Art 20mm F1.4 DG HSM Art Sigma introduces the world’s first ultra-wide-angle 20mm F1.4 DG HSM Art lens. Incorporating the same advanced optical technology as Sigma’s award-winning 24mm F1.4, 35mm F1.4 and 50mm F1.4 Art lenses, this ultra-wide angle, large aperture lens offers superb image quality and stunning bokeh. Incorporating the latest technology, this lens thoroughly corrects aberration and achieves ultra-high resolution for today’s high megapixel DSLRs, even near the edge of the image. Allowing the photographer to leverage the perspective provided by the wide-angle and the shallow depth of field provided by the large aperture, this lens is ideal not only for such ultra-wide-angle subject as landscapes and starry skies, but also for snapshots in low light, indoor photography, portraits with a natural bokeh effect, and many other shooting applications. SPECIAL FEATURES The 20mm F1.4 lens, is only possible through advances in large-diameter aspherical lens manufacturing technologies To offer an ultra-wide-angle 20mm focal length and F1.4 brightness at a wide-open aperture, this lens incorporates a large double aspherical lens 59mm in diameter. Lenses of this type had been considered extremely difficult to manufacture, but Sigma took on the challenge to realize an F1.4 ultra-wide-angle lens that fulfills the strict performance requirements of the Sigma Art line. What made this breakthrough possible were Sigma’s advanced manufacturing technologies, which the company has developed over time by producing a wide range of ultra-wide-angle and large-aperture lenses. Minimized chromatic aberrations This lens minimizes chromatic aberrations, a common issue in large-aperture ultra-wide-angle lenses. It features two FLO (“F” Low Dispersion)* glass and five SLD (Special Low Dispersion} glass elements to minimize transverse chromatic aberration, which is mainly visible around the edge of the image. The optimized lens power distribution helps minimize axial chromatic aberration. As a result, this lens delivers high image quality in every situation without color smearing, and its rendering performance is consistently sharp with high contrast. Minimized distortion Distortion is a common issue in wide-angle lenses, and it is not possible to correct it simply by changing the aperture value. For this reason, a lens must be designed from the start to minimize this issue. By adjusting the incidence angle of light starting with the first lens element and incorporating optimally positioned aspherical glass elements, the Sigma 20mm F1.4 DG HSM | Art lens minimizes distortion throughout the entire image. Designed to minimize flare and ghosting Advanced optical design and Sigma’s Super Multi-Layer Coating reduces flare and ghosting and provides sharp, high-contrast images, even in backlit conditions. Attaching the supplied petal-type lens hood provides extra protection from flare and ghosting. Sigma is Distributed Exclusively in Canada by Gentec International, One of Canada’s Best Managed Companies. www.gentec-intl.com • [email protected] Connect With Us ADDITIONAL FEATURES Rounded diaphragm The 9-blade rounded diaphragm creates an attractive blur to the out-of-focus areas of the image at large apertures. Hyper Sonic Motor ensures high AF speed The Hyper Sonic Motor (HSM) ensures silent, high-speed autofocusing, while the optimized AF algorithm helps realize even smoother AF performance. At any time during AF, users may access MF by simply rotating the focus ring. This feature makes faster focus adjustment possible, since there is no need to use the AF/MF focus mode switch. Brass bayonet mount A specially treated brass bayonet mount ensures maximum precision, greater strength, and superior durability for long-term use. Evaluation with Sigma’s “A1” MTF measuring system Replacing an MTF measuring system using conventional sensors, Sigma now employs a proprietary MTF (modulation transfer function) measuring system (A1) using 46-megapixel Foveon direct image sensors. Previously undetectable high-frequency details are now within the scope of Sigma’s quality control inspections. SPECIFICATIONS Focal Length . 20mm Minimum Aperture ......................................................... F16 Lens Construction ....................................... 15 Elements in 11 Groups Angle of View ............................................................ 94.5° Number of Diaphragm Blades ................................ 9 (rounded diaphragm) Minimum Focusing Distance ....................................... 27.6 cm / 10.9” 20 mm Maximum Magnification ................................................... 1:7.1 Filter Size ............................................................ 77 mm Dimensions ...................... Diameter: 90.7 mm / 3.6” x Length: 129.8 mm / 5.1” Weight ......................................................... 950 g / 33.5 oz Mounts (AF) ................................................ Canon, Nikon, Sigma Includes: Petal-type lens hood, cover lens cap (LC907-01), and rear lens cap Appearance and specifications are subject to change for improvement without notice. FLD Glass SLD Glass Aspherical Glass Sigma is Distributed Exclusively in Canada by Gentec International, One of Canada’s Best Managed Companies. www.gentec-intl.com • [email protected] Connect With Us TEST RESULTS Diffraction MTF Geometrical MTF Spatial Frequency Sagittal line Meridional line 10 lines per mm 30 lines per mm Vignetting Barrel Distortion (%) Barrel Distortion 20mm 20mm 20mm ACCESSORIES Sigma DG Digital Filters Manufactured to the same exacting standards as Sigma’s award-winning lenses, these premium multi-coated filters have been designed specifically for digital SLR cameras and offer superior optical performance. USB Dock compatibility Sigma has developed special software (Sigma Optimization Pro) that can update the lens firmware and adjust parameters such as micro-focus. For more information, contact: Lou Fallico, Director of Sales, Imaging Technology Division [email protected] Visit www.SigmaCanada.ca to learn more about the lenses, cameras, filters and accessories from Sigma, the world’s leading independent lens manufacturer. Follow Sigma Canada www.fb.com/SigmaCanada sigmacanada Sigma is Distributed Exclusively in Canada by Gentec International, One of Canada’s Best Managed Companies. 4/14 www.gentec-intl.com • [email protected] Connect With Us.
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