Sigma 17-50mm f/2.8 EX DC OS HSM (FLD) Autofocus APS-C Lens for Select Nikon F-Mount Cameras Review

The Sigma 17-50mm f/2.8 EX DC OS HSM is a standard zoom lens designed specifically for APS-C sensor Nikon F-mount cameras, delivering a versatile 25.5-75mm equivalent field of view. The constant f/2.8 aperture makes it a capable choice for low-light shooting and shallow depth of field control, while the optical stabilization (OS) system helps reduce camera shake. The HSM (Hyper Sonic Motor) provides quiet, fast autofocus, and the inclusion of FLD (Fluorite Low Dispersion) glass aims to minimize chromatic aberrations.

This lens occupies the workhorse standard zoom category, competing against both first-party Nikon options and third-party alternatives. At $147, it positions itself as an affordable entry into fast aperture zoom territory for Nikon DX shooters. The 77mm filter thread is larger than some competing lenses, which may add cost for filters but can improve optical performance. It's a practical option for photographers looking to upgrade from kit lenses without breaking the bank, though availability may vary as this is a used unit from KEH.