As part of the Art line within Sigma's Global Vision series, this lens is
designed to achieve truly notable optical performance and is ideally
suited for creative and artistic applications.
Wide-to-normal zoom is designed for DX-format Nikon F-mount cameras and provides a 27-52.5mm equivalent focal length range.
Impressively
bright constant f/1.8 maximum aperture is well-suited for working in
low-light conditions and also provides greater control over the focus
position when using shallow depth of field techniques.
Five
Special Low Dispersion (SLD) elements are featured in the optical
design and help to reduce color fringing and chromatic aberrations for
improved clarity and color accuracy.
Four
aspherical elements are used to help limit distortion and spherical
aberrations and also contribute to greater overall sharpness and
accurate rendering.