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Sigma officially announced the rumored 18-35mm f/1.8 DC HSM lens, world’s first wide-aperture lens to offer an aperture of F1.8 throughout the zoom range, the lens captures sharp images even at wide end with F1.8 aperture,the lens is designed for APS-C format DSLRs and SLT,

Sigma 18-35mm f/1.8 Key Features

• 18-35mm, 27.5-52.5mm equivalent
• Constant f/1.8 aperture – f/16 minimum
• 9 rounded diaphragm blades
• 17 elements in 12 groups
• Special Low Dispersion (SLD) glass
• A – Art series lens
• 72mm filter thread
• Internal focusing and zooming
• Super Multi-Layer Coating
• AF/MF switch on side
• 28cm closest focus distance
• 1:4.3 maximum magnification ratio
• Hyper Sonic Motor (HSM)
• 78x121mm (diameter x length)
• 810g

“To develop a large aperture zoom lens with a maximum aperture of F1.8, it was necessary to solve a variety of technical challenges.” – Sigma

To develop a large aperture zoom lens with a maximum aperture of F1.8, it was necessary to solve a variety of technical challenges. As the f-number decreases, so does the depth of focus, making it extremely difficult to minimize spherical aberration, axial chromatic aberration, astigmatism and field curvature. To minimize astigmatism across the zoom range, Sigma leveraged its extensive experience in reducing optical aberrations and designing advanced structural elements. Sigma gained this know-how when it developed such super wide angle zoom lenses as the SIGMA12-24mm F4.5-5.6 II DG HSM and SIGMA 8-16mm F4.5-5.6 DC HSM. Ongoing technological innovation at Sigma’s Aizu Factory has also contributed to further enhancements in lens production. Advanced production technologies have made possible a large-diameter molded glass aspheric lens, which teams up with SLD (Special Low Dispersion) glass elements to optimize power distribution and minimize axial chromatic and spherical aberration and field curvature. Thanks to its hard-earned knowledge of lens design and advanced lens manufacturing techniques, Sigma has succeeded in creating a lens that offers F1.8 throughout the zoom range, as well as exceptional image quality at wide open aperture.

Sigam F1.8 Zoom Lens MTF Chart

Based on MTF chart, the lens look really very sharp at wide and tele-end.

Sigma 18-35mm F1.8 Lens Major Specification

No information about the pricing is available yet, but we will update you soon with latest price and Sigma 18-35mm f/1.8 DC HSM lens sample images, stay with us on G+, twitter and Facebook.