Sigma just announced one of the fastest zoom lenses for DSLRs that we have ever seen – the 18-35mm f/1.8 DC HSM Art lens for APS-C sensor DSLRs. It’s the world’s first constant f/1.8 zoom lens. A typical speed for high quality zoom lenses is f/2.8, so 1.8 is a big step up from that (don’t forget, after all aperture is an exponental value, meaning that every stop more gives you twice the amount of light. The only fast zoom lens that comes pretty close is the Olympus 14-35mm f/2.0, but that’s a Four Thirds model. It makes a HUGE difference to have faster lenses, even if it’s only a one or two stops more. And so far, one of the biggest problems of zoom lenses was the fact that they were nowhere near as fast as fast primes (that typically come in at f/1.4). Sigma’s new f/1.8 zoom is only half a stop away from that – pretty impressive. UPDATE, June 14: Pricing is out and it is spectacularly low for such a fast zoom lens – $799! It is available to preorder from B&H now. Available July 31.Read more
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