![]() ![]() 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. For Sale or Trade: SMC PENTAX K 1:3.5/18mm.Theme Contest #204 - August, 2023 (People).Caption Contest Caption Contest ending 10 August 2023.Weekly Challenge Winner - Weekly Challenge #622.Weekly Challenge Weekly Challenge #623, Wildflowers.Project 52 PROJECT 52-11-48- LIGHTING -Side Lighting.Thematic Post Processing Challenge #474. ![]() Monster Adapter LA-KE1 Pentax K to Sony E Lens Adapter.Pentax K-3 III eBook Version 1.6 Released.The Making of "My best friend, Buckley".Announcing Our August, 2023 Photo Contest.Legacy Pentax Glass Lives On with Mirrorless. ![]()
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