We spent the weekend with a fairly-close-to-final prototype of the 18-35mm f/1.8 and our initial impressions of it were quite positive. The lens itself is a member of Sigma's Art Series, and, like all their other Art Series lenes, it offers really beautiful build-quality and attention to detail, in terms of materials and finish. The zoom and focus ring both also provide a nice amount of damping, for smooth steady turning. The lens itself weighs about the same as a Canon 16-35mm f/2.8, and is about the same size as well (just a bit taller). However, for full impressions of how the lens functioned, you'll have to wait until we get a final version that we can run through our test lab. For now, check out the 20 sample images in the gallery at the right.