We know that Canon doesn't really support or motivate third parties to build RF mount…
Sigma press release:
Sigma 14-24mm F2.8 DG HSM Art and Sigma 24-70mm F2.8 DG OS HSM Art Receive Prestigious TIPA World Awards 2018
April 19, 2018 – The Sigma Corporation is pleased to announce it has won two TIPA World Awards 2018 for its wide-aperture ultra-wide-angle 14-24mm F2.8 DG HSM Art zoom lens and its large-diameter 24-70mm F2.8 DG OS HSM Art zoom lens suitable for any shoot.
TIPA’s Best DSLR Wide Angle Zoom Lens Award for Sigma 14-24mm F2.8 DG HSM Art:
A Perfect Match for Today’s High-Resolution Cameras
Mountable on Canon, Nikon and Sigma cameras, and compatible with the Sigma MC-11 Sony E-mount converter, the Sigma 14-24mm F2.8 DG HSM Art lens delivers a high level of sharpness with near zero distortion, along with high-speed and high-accuracy AF that matches up perfectly with today’s high-resolution cameras. The lens contains three FLD (“F” Low Dispersion) glass elements, three SLD (Super Low Dispersion) glass elements, and three aspherical lens elements, including an 80mm high precision molded glass aspherical element. It has special sealing at numerous points for dust- and splash-proof protection. Thoroughly modern, the Nikon mount features a brand new electromagnetic diaphragm; the Canon mount is compatible with the Canon Lens Aberration Correction function.
TIPA’s Best DSLR Standard Zoom Lens Award for Sigma 24-70mm F2.8 DG OS HSM Art:
A Premium “All-Round” Zoom
For many photographers, the 24-70mm focal length range is considered the standard as an everyday lens for a wide variety of subjects and scenarios, including street and photojournalism work, candids, travel and even nature and landscape photography. The Sigma 24-70mm F2.8 DG OS HSM Art offers many advantages, including a constant aperture throughout its range, an optical stabilization system, and outstanding bokeh effects due to its 9-blade, rounded-diaphragm, 37cm (15”) close-focusing capability. The lens is dust- and splash-proof and incorporates a newly designed hypersonic motor (HSM) for fast and smooth AF operation. The lens also incorporates the latest electromagnetic aperture control for specific Nikon cameras; the Canon mount is compatible with the Canon Lens Aberration Correction function.
Currently, 30 publications from Europe and other parts of the world are members of the TIPA (Technical Image Press Association) organization, and chief editors and technical editors of these publications constitute this organization. Since 1991, TIPA has presented many awards in several sectors, including imaging. In 2018, TIPA changed the name of the award to the TIPA World Awards to reflect the current composition of its membership, its publications, as well as the global influence of the TIPA award itself. http://www.tipa.com/
About Sigma Corporation
Craftsmanship. Precision. Dedication. Since 1961, Sigma has been devoted to the pursuit of advancing photographic technology. Unique to the industry, the family-owned business produces its high-quality, award-winning cine and camera lenses, DSLR and mirrorless cameras, flashes, filters and accessories from its state-of-the-art manufacturing facility located in Aizu, Japan.
In 2012, the company introduced the Sigma Global Vision with three distinct lens lines: Art, Contempo-rary and Sport. Designed for industry camera mount systems including Canon, Nikon, Olympus, Pen-tax, Sony and Sigma, each lens is handcrafted and tested in Japan to ensure a high-performance, premium product that is purpose-built to last.
Sigma continues its tradition of imaging excellence with the mirrorless sd Quattro, sd Quattro H and the compact dp Quattro camera line. Leveraging the ultra-high resolution Foveon sensor, the Sigma Quat-tro cameras are designed to produce the highest quality image with every shot.