Lenses : Sigma Reorganizes Lens Portfolio into Three Lines, Adds New Lenses & Quality ControlSeptember 24, 2012
The creation of these new categories comes with the introduction of three lenses:
- 17-70mm f/2.8-4 DC OS Macro. In the Contemporary line, this lens is designed for cameras with an APS-C sensor and covers a 25.5-105mm equivalent range. An upgrade to its predecessor, which was released in December 2009, this general-purpose lens has a new, more compact design.
- 35mm f/1.4 DG HSM. This Art lens provides an alternative to the more conventional 50mm, with one FLD glass lens and four SLD glass lenses to help ensure correction of axial chromatic and lateral aberration. At low apertures, it can perform like a wide-angle lens; when opened up to f/1.4, it will provide background bokeh like a mid-range telephoto lens.
- 120-300mm f/2.8 DG OS HSM. Employing redesigned mechanics, this lens in the Sports category is an update from its predecessor that was released in February 2011. It offers a maximum focal length of 300mm and a wide-open aperture of f/2.8. Like the other Sports category lenses to come, it is dust and moisture resistant and also allows users to adjust the focus speed and the focus limiter via a button on the lens.
New User-Control Tools and Software, New Quality Control Measures
Sigma also announced Sigma Optimization Pro software and a USB dock, both designed exclusively for these new product lines. They will enable Sigma users to connect their lenses to their computers to update lens firmware and fine-tune focus parameters via on-screen controls.
And all new lenses will be subject to Sigma’s new, proprietary modulation transfer function (MTF) measuring system, called “A1.” Named in honor of the company’s sole production base, the Aizu factory in Aizu, Japan, the A1 system is designed to enable inspectors to verify previously undetectable high-frequency details in each lens before it is shipped.
“We used to measure lens performance with a MTF measuring system using conventional sensors, but this new A1 system uses our own 46 megapixel Foveon direct imaging sensors,” explained Yamaki. “We view this new method of performance evaluation as being incredibly important, not only because we owe it to our customers but because we owe it to ourselves. We’ve spent more than 50 years perfecting our design and manufacturing processes, and now we deliver a complete package by closing the loop on that commitment to quality by adopting a more stringent verification process.” sigmaphoto.com