Fast ultra-wide zooms for APS-C mirrorless cameras have historically meant a tradeoff: a constant f/2.8 aperture across a wide range, but at a size and weight that undercut the portability APS-C systems are supposed to offer. Sigma's 10-18mm F2.8 DC DN, released in October 2023, breaks that pattern — at 72.2 x 62mm and just 260 grams, it's smaller than Sigma's own 16mm F1.4 DC DN prime, which had previously been the widest lens in the brand's APS-C lineup.
Covering a 15-27mm full-frame-equivalent range across Sony E, Fujifilm X, and L-mount, it uses 13 elements in 10 groups — including three fluorite-like FLD elements — driven by a stepper-motor autofocus system reviewers describe as fast and quiet. Available for Sony, Fujifilm, and L-mount systems, it's become the go-to recommendation for landscape and architecture shooters who don't want to give up portability for a fast aperture.
