![]() ![]() This is especially true in our pixel-peeping, megapixel-counting, measureabating world of modern photography. Many would argue that if there is just one attribute in a lens to pay overt attention to, it would be sharpness and the maximum resolution the lens in question is capable of. * 3 L-Mount is a registered trademark of Leica Camera AG. Sigma 18-35mm F1.8 DC HSM 'Art' Sharpness. The image quality from the Sigma 18-35mm f/1.8 DC HSM ART lens is exceptional in every facet, and the fact that Sigma managed to go a full 1 1/3 stops wider than other zoom lenses while still nailing the image quality is a huge achievement in engineering. * 2 This product is developed, manufactured and sold based on the specifications of E-mount which was disclosed by Sony Corporation under the license agreement with Sony Corporation. For Nikon F mount cameras, please see Nikon camera compatibility Functionality may be limited on some camera bodies. * 1 The Nikon mount version of this lens includes an electromagnetic diaphragm mechanism. The degree to which light is refracted by glass depends on the light's waveleng… The polygonal shape of a conventional iris dia phragm causes out-of-focus light… The Hyper Sonic Motor (HSM) is an original SIGMA development that uses ultrason… The lens mount incorporates rubber sealing to protect the mount from dust and w… On eBay, you can find many Sigma 18-35 mm used focal camera lenses that have many features for good value. Mount with Dust and Splash Resistant Structure The Sigma 18-35mm is also designed to be the world’s first wide-aperture lens that has an aperture of F1.8 throughout the zoom range with Digital LSR and both auto and manual focus.The brass mount combines high precision with rugged construction. High-precision, rugged brass bayonet mount.The Nikon mount version of this lens includes an electromagnetic diaphragm mech… Nikon electromagnetic diaphragm mechanism. ![]() 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. The Sigma 18-35mm f1.8 DC HSM is the first wide-angle to standard zoom lens to achieve a large aperture of 1.8, creating beautiful background blur with a 9. In particular, FLD glass offers ultra-low dispersion in combination with high transmittance and the anomalous dispersion characteristics of fluorite. 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 (“F” Low Dispersion). Yet residual chromatic aberration known as “secondary spectrum” may still remain. Most chromatic aberration can be removed by combining a high-refractivity convex lens element with a low-refractivity concave element. The result is chromatic aberration, the color fringing that is particularly noticeable in telephoto lenses. This fact causes different colors of light to focus at slightly different points. The degree to which light is refracted by glass depends on the light’s wavelength. ![]()
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