{"id":13684,"date":"2019-05-30T12:09:06","date_gmt":"2019-05-30T09:09:38","guid":{"rendered":"http:\/\/utopiacam.com\/?post_type=product&p=13684"},"modified":"2019-06-12T11:06:13","modified_gmt":"2019-06-12T08:06:13","slug":"ef-24mm-f-1-4-dg-hsm-art","status":"publish","type":"product","link":"https:\/\/utopiacam.com\/en\/shop\/ef-24mm-f-1-4-dg-hsm-art\/","title":{"rendered":"EF 24mm f\/1.4 DG HSM Art"},"content":{"rendered":"

A wide and fast Canon EF-mount prime, the\u00a024mm f\/1.4 DG HSM Lens<\/b>\u00a0is a member of the highly regarded Art line of\u00a0Sigma’s<\/b>\u00a0Global Vision Series and is characterized by its advanced optical construction and robust physical design. The combination of three “F” Low Dispersion (FLD) elements and four Special Low Dispersion elements help to achieve a marked reduction in chromatic aberrations, while a pair of aspherical elements, with one positioned in the rear of the lens, minimize a variety of additional distortions and aberrations. The 15-element-in-11-group optical design is poised to deliver consistent peripheral brightness and sharpness, even when working at the bright f\/1.4 maximum aperture. A Super Multi Coating has been applied to lens elements, too, to reduce flare and ghosting for higher contrast and color fidelity.<\/p>\n

\"Lens<\/p>\n

Complementing the optical performance is an equally adept Hyper Sonic Motor, which provides fast, smooth, and near-silent autofocus performance. This focusing motor also enables full-time manual focus override at any time just by rotating the focus ring for refined manual control and focusing as close as 10.9″. The lens barrel is constructed using a Thermally Stable Composite material, which supports working in a wide variety of temperatures and conditions, and the lens mount is constructed from brass for long-term durability and mounting accuracy. Additionally, this lens is also compatible with the optional Sigma USB Dock for fine-tuned control over focusing parameters and other lens characteristics.<\/p>\n

Exclusive low-dispersion glass<\/strong>
\nThe degree to which light is refracted by glass depends on the light’s wavelength. This fact causes different colors of light to focus at slightly different points. The result is chromatic aberration, the color fringing that is particularly noticeable in telephoto lenses. Most chromatic aberration can be removed by combining a high-refractivity convex lens element with a low-refractivity concave element. Yet residual chromatic aberration known as \u201csecondary spectrum\u201d may still remain. To minimize this secondary spectrum, which can be a serious issue with conventional lenses, SIGMA lenses feature up to three types of exclusive low-dispersion glass offering superior performance: ELD (Extraordinary Low Dispersion), SLD (Special Low Dispersion) and FLD (\u201cF\u201d Low Dispersion). In particular, FLD glass offers ultra-low dispersion in combination with high transmittance and the anomalous dispersion characteristics of fluorite. Meticulous deployment of these types of exclusive low-dispersion glass and optimization of power distribution gives SIGMA lenses superlative image rendition undiminished by residual chromatic aberration.<\/p>\n

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Focus<\/strong><\/p>\n