Introduction
The Sigma 14-24mm F2.8 DG DN Art is a new ultra-wide-angle zoom lens that’s available for both full-frame Sony E-Mount and L-Mount mirrorless cameras from Panasonic, Sigma and Leica.
It features a constant maximum aperture of f/2.8 throughout the zoom range and offers the equivalent angle of view as a 21-36mm lens when used on an APS-C camera.
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https://www.photographyblog.com/reviews/sigma_14_24mm_f2_8_dg_dn_review