Sigma 28-105mm F2.8 DG DN | Art (L-Mount)

Sigma's 28-105mm Art is a standard zoom with a constant f/2.8 aperture all the way to 105mm, reaching further into telephoto territory than a typical 24-70mm f/2.8. On L-Mount it weighs 995g and is 157.9mm long, so it is noticeably bigger than a typical 24-70mm f/2.8; Sigma used a magnesium-alloy section around the mount to keep it under a kilogram.

The optics use two FLD, one SLD and five aspherical elements, and the 12-blade aperture keeps highlights round when stopped down. An HLA linear motor drives focus, and Sigma designed it for minimal focus breathing. The barrel carries a de-clickable aperture ring with lock, a zoom lock, two AFL buttons and an AF/MF switch, plus dust and splash sealing and a water- and oil-repellent front element. It focuses to 40cm throughout the range, giving 1:3.1 at 105mm.