The next review on my list is the brand new full frame 24-35mm f/2 from Sigma. Balancing the optical merits, this 18-35mm also sports an advanced Hyper Sonic Motor, along with an internal focusing design, to promote fast, quiet, and precise autofocus performance. The image quality from the Sigma 18-35mm f/1.8 DC HSM ART lens is exceptional in every facet, and the fact that Sigma managed to go a full 1 1/3 stops wider than other zoom lenses while still nailing the image quality is a huge achievement in engineering. They make it extremely simple to calibrate your electronic follow focus, while giving you a rigid hard stop even when using a manual follow focus. Requiring a larger image circle for full sensor coverage, these cameras will show vignetting when the 18-35. But, this lens mounts and functions on full frame camera models. Being a 'DC' lens, the Sigma 18-35 f/1.8 is designed to cover the image circle of APS-C format cameras. A Super Multi-Layer Coating has also been applied, too, which controls lens flare and ghosting for improved contrast and color accuracy. The Sigma Corporation presented the Sigma A 1835 mm f/1.8 DC HSM a zoom lens designed for APS-C/DX sensors which was also the fastest mass-produced zoom in the history of photography. Using the Sigma 18-35mm f/1.8 DC HSM Art Lens on a Full Frame Body. Saying that, I use the 18-35 on a Pocket6k regularly on a Ronin and usually have a focus puller focusing with a wireless follow focus. Without the lens mounted to the camera (lens not getting power), if you turn the focus ring, you can see the glass element in the lens moving. Sigma’s Art line has been getting a lot of buzz over. The 18-35 most definitely isnt a focus by wire lens. As an added bonus, it offers a fast constant aperture (f/1.8) that’s practically unheard of in similar zoom lenses. The optical design incorporates a series of SLD and aspherical elements, which help to achieve high clarity and sharpness by suppressing various aberrations, color fringing, and distortion. Sigma 18-35mm f/1.8 Art Lens offers a focal range that makes it useful for a number of different genres of photography such as weddings, portraits, and family photography. Separating itself from the pack, this zoom features an exceedingly bright f/1.8 constant maximum aperture, which suits its use in difficult lighting conditions and offers impressive depth of field control throughout the zoom range. Distinguished by a uniquely fast and versatile design, the Canon EF-mount Sigma 18-35mm f/1.8 DC HSM is an Art-series zoom, covering wide-angle to normal focal lengths.
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