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The Sigma 18-35mm is
a revolutionary, wide-angle to normal zoom lens for APS-C cameras, famous for being the first to offer a constant, super-fast f/1.8 aperture across its entire range, making it excellent for low light and shallow depth of field. Part of Sigma's Art series, it features advanced glass (SLD & aspherical elements) for sharpness, Super Multi-Layer Coating to reduce flare, internal focusing, and a Hyper Sonic Motor (HSM) for fast, quiet AF, though its build is known to be substantial.