Sigma has announced three new lenses at Photokina:
The 17-70 mm f/2.8-4 DC OS Macro is designed for cameras with an APS-C sensor and is the equivalent of 25.5-105 mm.
An upgrade to its predecessor, released in late 2009, this general purpose lens offers a new design and a more compact build.
The 35 mm f/1.4 DG HSM is an alternative to the more conventional 50 mm.
This lens’ axial chromatic aberration is minimized, which renders a smooth out-of-focus image. At low apertures, it can perform like a wide-angle lens; when opened up to f/1.4 it will provide background bokeh and make the subject pop like a mid-range telephoto lens.
The 120-300 mm F2.8 DG OS HSM is an update of the lens released in early 2011, with redesigned mechanics and performance.
This lens is dust and moisture resistant, and allows users to adjust the focus speed and the focus limiter via a button on the lens.