![]() ![]() The issue is not speed - the Sigma 18-35 was fantastic in that regard. To put it bluntly, we have never experienced such autofocus difficulties before. Unfortunately this is where the good news ends. There's some very minor high-pitched knocks that can be discerned as the lens makes its micro adjustments, but the audible range of it is mostly limited to having the lens close to your ear when looking through the viewfinder. We'll start with the good news first - the lens focuses in a manner that is extremely quick, as you'd expect, and also virtually inaudible. Sigma 18-35 "Art" Autofocus - Performance This becomes all the more confidence-inducing when coupled with the 4-year warranty that Sigma's lenses features. Sigma's HSM has come to be highly-regarded for its reliability, a great thing for users that are planning to make this lens a long-term investment. One thing that hasn't changed as part of that new framework is the autofocus system. Lastly, it's been mentioned more than just a few times now that the 18-35 is part of a new lineup of lenses with new Sigma's Global Vision restructuring. What this means is that no matter how you have the lens or camera body set, either to Autofocus or Manual Focus mode, you are free to rotate the focus ring as you desire. This Sigma "Art" zoom features full-time manual focus override, known as "Quick-Shift" among Pentaxians, as you'd expect from such a premium optic. This only further accentuates the phenomenal build quality of the 18-35. And this is meant as a compliment - it was very reassuring and left us with zero concerns that even with the roughest of uses, it would never change unless you actively made the decision to do so. Located in the perfect position for your thumb to play with while holding the lens and looking through the viewfinder, one of the most immediate impressions that stuck with us when we first handled the lens was how stiff it proved to activate and switch between the two modes. This switch and the two positions can be clearly seen in the animation to the right. The lens features a sole physical customizable feature on the lens itself - the "AF/MF" selector switch to alternate between auto and manual focus. In case you forgot or just skipped that page entirely (you know who you are.), the following animation proves that: In case you may find yourself looking in your DSLR's mirror box to see if the two pins are there, this is what you should be looking for (shown using a Pentax K-3):Īs mentioned during the construction and handling page, the lens features in-lens focusing so that no piece of the lens protrudes or retracts when moving between minimum focus distance and infinity. In case you might not understand why, it's simply because previous camera bodies were not equipped with the two gold pins that paired with the rectangular contacts shown below that Pentax uses for its own proprietary SDM and DC in-lens autofocus motors (and thus Sigma's HSM implementation): The rear lens mount of the Sigma 18-35 shows that it can only focus using the K10D bodies or newer. It is compatible with all Pentax DSLRs since 2006 and Sigma promises it to not only be fast and accurate but silent in operation. The Sigma 18-35 F1.8 "Art" incorporates Sigma's proprietary autofocus, the "Hyper Sonic Motor," or the HSM acronym that can be found in the official name of the lens. Incorporating Sigma's state-of-the-art HSM motor, does the 18-35 "Art" autofocus match the excellent optical qualities of the world's fastest (and so far only as of this review's publication) F1.8 constant aperture zoom lens? Sigma 18-35 "Art" Autofocus - Technical Now that we've scrutinized everything about the lens we could, both its construction and image quality, our last dedicated assessment is of how the lens acquires those images - its autofocus system. Point & Shoot Contest #185 - Shoot what you want.True meanings behind "Alice in Wonderland.". ![]() Linux (Ubuntu) youtube to dvd conversion (?) & I still have webcam sound problem.Nature Scarlet Honeyeater ((Myzomela sanguinolenta).What paint do I use for indented plastic letters and logo.Weekly Challenge WINNERS: Weekly Challenge #621, Food!.Weekly Challenge Weekly Challenge # 622: Beauty in the Everyday.Caption Contest Caption contest ending august 3.Thematic Post Processing Challenge #473.Project 52 PROJECT 52-11-47-LIGHTING -Backlighting.Monster Adapter LA-KE1 Pentax K to Sony E Lens Adapter.June "Pets" Contest Finalists Announced.Pentax K-3 III Monochrome Review Posted.Pentax K-3 III eBook Version 1.6 Released.The Making of "My best friend, Buckley". ![]()
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