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This all bodes well for the company's latest offering the recordbreaking 15mm F18 DC HSM, which is the first constant F18 SLR zoom lens to hit the market Sigma's choice of F18 as maximum aperture isn't a coincidence;The Sigma 15mm f/18 DC HSM Art lens, shown with the lens hood attached (Source Sigma) The optical design (shown below) consists of 17 elements in 12 groups and includes a large glassmoulded aspherical lens (one of four aspherical elements) plus five elements made from Special Low Dispersion (SLD) glass to compensate for aberrations and curvature at the widest angleSigma 15mm f/18 DC HSM Lens Review February 19, 14 By Eric Reagan The Sigma 15mm f/18 DC HSM lens is built for APSC format cameras, providing a mm equivalent full frame field of view Korean Site Publishes Sample Images From Sigma 18 35mm F1 8 Dc Hsm Digital Photography Review Sigma 18-35mm f/1.8 dc hsm art lens review