The Super Multi-Layer Coating reduces flare and ghosting according to Sigma. The circular 9-bladed F1.4 aperture ensures excellent brightness and blurred background (bokeh) effects. With a bright F1.4 maximum aperture, floating inner focusing system, and Hyper Sonic Motor (HSM) you'll have quick and accurate control. Weather-resistant construction with a brass bayonet that affords improved mounting accuracy and rigidity.The 35mm f/1.4 DG HSM Art Lens for Pentax DSLR Cameras from Sigma is the first entry into Sigma's Art series of professional lenses, with an emphasis on artistic expression and the creative potential of the lens.Rounded eleven-blade diaphragm contributes to a smooth and pleasing bokeh quality.Built-in Autofocus-Lock (AFL) button which can be assigned additional functions widens the range of operations available on the lens.Additionally, a dedicated aperture ring lock switch can also be employed to prevent accidental shifting of the aperture setting. Manual aperture ring can be de-clicked for smooth, silent aperture switching to benefit video applications.Face and eye detection supported in feature enabled cameras. Integrated stepping motor realizes quick and quiet internal autofocus, which is further complemented by an optimized AF algorithm to produce smoother focusing performance.Resistance coating allows oil and water to be easily wiped from the front lens surface and prevents oil and fat from sticking for easy cleaning. A Super Multi-Layer Coating has been applied to lens elements in order to minimize lens flare and ghosting and contribute to producing contrast-rich and color-neutral imagery, even in backlit conditions.Lens Construction: 15 elements in 11 groups, including one FLD low-dispersion element, one ELD extra-low dispersion element, two SLD special-low dispersion elements, and two aspherical elements.Bright f/1.4 maximum aperture is particularly well-suited for working in available light conditions and provides extensive control over depth of field for isolating subject matter with selective focus. Wide-angle lens is designed for full-frame Sony E-mount mirrorless cameras but can also be used with APS-C models where it provides a 52.5mm equivalent focal length.As part of the Art line within Sigmas Global Vision series, this lens is designed to achieve truly notable optical performance and is ideally suited for creative and artistic applications.Additionally, the lens features an 11-blade rounded diaphragm for smooth bokeh quality and the lens housing is also weather-sealed to suit working in inclement conditions. For autofocus, a stepping motor is used that maintains a lightweight and compact design while promoting fast and near silent focusing performance for both stills and video applications. Balancing the optics is a refined exterior design, which features a physical aperture ring, which can be de-clicked or locked, along with a dedicated focus mode switch and AFL button for intuitive and tactile control. Also, a Super Multi-Layer Coating enhances image quality by suppressing lens flare and ghosting for improved contrast and color fidelity in strong lighting conditions. It also incorporates two aspherical elements and high refractive index elements to achieve a notable degree of clarity and sharpness with well-controlled distortion and aberrations. The optical layout incorporates two SLD Special-Low Dispersion, one ELD Extra-Low Dispersion, and one FLD Low Dispersion elements. The f/1.4 maximum aperture enables working in low-light conditions and also provides increased control over depth of field for achieving shallow depth of field effects. A classic wide angle lens updated for full-frame Sony E-mount mirrorless systems, the 35mm f/1.4 DG DN from Sigma is an Art-series prime characterized by its advanced and updated optical design, sleek profile, and bright design.
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