...Like Nikon didn't have enough troubles already.
Sigma seems determined to become the go-to brand for top quality at a fair(er) price...its Art and Contemporary series of DSLR lenses (one of which I reviewed not long ago) has just increased by not one, not two, not three, but four new lenses.
The new focal lengths are: the Sigma 135mm ƒ/1.8 DG HSM Art; the Sigma 100–400mm ƒ/5–6.3 DG OS HSM Contemporary; the Sigma 14mm ƒ/1.8 DG HSM Art; and the Sigma 24–70mm ƒ/2.8 DG OS HSM Art. All are initially available in Nikon, Canon, and Sigma SA mounts. All are "DG" lenses that will cover full-frame (24x36mm).
The 24–70mm, because it's a workhorse lens for many photographers, is Sigma's third revision of its lens of this specification. This newest iteration is said to offer better construction and better image stabilization. Interestingly, Sigma claims it has been specifically optimized for better bokeh. Mark Mandl has provided a translation that communicates the meaning of the original Japanese text "球面収差をわずかに残すことでボケの描写にもこだわりました" from the 24–70mm's product page on Sigma's Japanese website: "The quality of the bokeh has been carefully tuned by leaving a trace amount of spherical aberration." (Thanks to Mark.)
The 135mm and 14mm primes both qualify as superfast—the 14mm in particular is claimed to be the fastest full-frame lens of its focal length ever made.
They're not on sale yet and not available for pre-order, but here's a link to more pictures and full specs at B&H.
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Featured Comments from:
Jim Richardson: "To me the blockbuster lens in the new Sigma lineup is the 14mm ƒ/1.8 Art lens. For Milky Way photography this one is really important since you are limited in exposure time by star movement. This new lens means either you can halve your ISO for lower noise or double your effective exposure for richer star field rendering. Either way (assuming it's rendering of stars out at the edge of the frame) is decent to good we should start seeing a new generation of night sky photographs, similar to what happened when the Nikon D3 and the 14–24mm ƒ/2.8 Nikkor came along."