For its latest lens launch, Sigma has taken an unusually low-key approach: The brand-new Art-series Sigma 24-105mm F4 DG OS HSM itself does the talking, with no formal announcement made alongside its introduction. But don't let that sell it short: It looks like a very interesting lens indeed.
With approximately a 4.4x optical zoom, the new lens has a constant f/4 maximum aperture, and covers everything from a generous wide angle to a moderate telephoto with a full frame 35mm image circle. (Of course, you can use it on a…
via Imaging Resource News Page http://www.imaging-resource.com/news/2013/10/14/sigma-quietly-introduces-constant-aperture-full-frame-24-105mm-f-4-zoom-len