Sigma 18-50mm f/2.8 DC DN Contemporary Lens for L-Mount

This lens provides a versatile full-frame equivalent zoom range of 27-75mm and a wide constant aperture of f/2.8 throughout the entire zoom range. The lens design includes three high-precision glass-molded aspherical elements coupled with a special low dispersion element. Together they minimize the total number of elements for superb optical quality without excessive weight.Standard zoom lens is designed for APS-C-format L-mount cameras and provides a 27-75mm equivalent focal length range.Constant f/2.8 maximum aperture is well-suited for working in low-light conditions and provides greater control over the focus position when using shallow depth of field techniques.Three high-precision glass-molded aspherical elements are used to help limit distortion and spherical aberrations and contribute to greater overall sharpness and accurate rendering.Special Low Dispersion (SLD) element reduces chromatic aberrations and color fringing.Super Multi-Layer Coating minimizes flare and ghosting for improved contrast and color accuracy when working in strong lighting conditions.In-camera aberration correction further eliminates optical imperfections such as distortion and vignetting.Stepping motor with nearly silent autofocus that makes it perfectly suited to a range of photographic applications, including shooting in quiet environments, recording videos, and capturing fast-moving subjects.Minimum focusing distance of 4.8" and a 1:2.8 maximum magnification ratio benefits working with close-up subjects.Rounded seven-blade diaphragm contributes to a pleasing bokeh quality.Compatible with Sigma UD-11 USB Dock.Focal Length   18 to 50mm (35mm Equivalent Focal Length: 27 to 75mm)Maximum Aperture   f/2.8Minimum Aperture   f/22Lens Mount  L-MountFormat Compatibility   APS-CAngle of View   76.5° to 31.7°Minimum Focus Distance   4.8" / 12.1 cmMaximum Magnification   0.36xMacro Reproduction Ratio   1:2.8Optical Design   13 Elements in 10 GroupsDiaphragm Blades   7, RoundedFocus Type   AutofocusImage Stabilization   NoFilter Size   55 mm (Front)Dimensions (ø x L)   2.5 x 2.9" / 64.5 x 74.5 mmWeight   10.2 oz / 290 g