Overview

The Sigma AF 18-125mm f/3.5-5.6 DC is a 7x zoom for APS-C DSLRs, offering a versatile ~29-200mm equivalent range. Optically, it performs better at shorter focal lengths with good distortion control and minimal chromatic aberrations, though sharpness falls off at longer ends. Build quality is decent for a budget lens: a metal mount, smooth zoom ring, and a zoom lock, but AF accuracy is poor at wide angles. It suits photographers seeking a lightweight, all-in-one walk-around lens for general use, but not for critical or fast-action work.