For Nikon F mount cameras, please see Nikon camera compatibility Functionality may be limited on some camera bodies. * The Nikon mount version of this lens includes an electromagnetic diaphragm mechanism. The degree to which light is refracted by glass depends on the light's waveleng… The polygonal shape of a conventional iris dia phragm causes out-of-focus light… The Hyper Sonic Motor (HSM) is an original SIGMA development that uses ultrason… Incorporates a water and oil-repellent coating that allows water to be wiped aw… The lens mount incorporates rubber sealing to protect the mount from dust and w… Mount with Dust and Splash Resistant Structure.The brass mount combines high precision with rugged construction. High-precision, rugged brass bayonet mount.The Nikon mount version of this lens includes an electromagnetic diaphragm mech… Nikon electromagnetic diaphragm mechanism.Meticulous deployment of these types of exclusive low-dispersion glass and optimization of power distribution gives SIGMA lenses superlative image rendition undiminished by residual chromatic aberration. In particular, FLD glass offers ultra-low dispersion in combination with high transmittance and the anomalous dispersion characteristics of fluorite. To minimize this secondary spectrum, which can be a serious issue with conventional lenses, SIGMA lenses feature up to three types of exclusive low-dispersion glass offering superior performance: ELD (Extraordinary Low Dispersion), SLD (Special Low Dispersion) and FLD (“F” Low Dispersion). Yet residual chromatic aberration known as “secondary spectrum” may still remain. Most chromatic aberration can be removed by combining a high-refractivity convex lens element with a low-refractivity concave element. The result is chromatic aberration, the color fringing that is particularly noticeable in telephoto lenses. This fact causes different colors of light to focus at slightly different points. UMC lens coating allows even light transmission and minimizes ghosting and flare.īuilt-in petal style lens hood blocks unwanted stray light and protects the lens.The degree to which light is refracted by glass depends on the light’s wavelength. Maximum aperture of f/2.8 for effective low light shooting and shallow depth of field focusĪspherical, Hybrid Aspherical and Extra-low Dispersion lens elements reduce aberrations. The minimum focus distance for this lens is 11".Ĭompatible with full frame and APS-C format Sony E-mount mirrorless cameras. UMC lens coating facilitates even light transmission and reduces ghosting and flare. With extra-low dispersion, aspherical and hybrid aspherical lens elements, chromatic aberrations are minimized and sharp, color-accurate images are the result. A maximum aperture of f/2.8 is effective in low light shooting and provides shallow depth of field control. On APS-C format cameras it provides a 35mm format focal length equivalency of 21mm. The 14mm f/2.8 ED AS IF UMC Lens for Sony E Mount from Samyang is a manual focus, manual aperture, ultra-wide angle prime lens compatible with full frame and APS-C format Sony NEX mirrorless digital cameras.
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