Sigma 18-250mm f/3.5-6.3 DC OS HSM - unknown Mount

The Sigma 18-250mm f/3.5-6.3 DC OS HSM is a high-ratio superzoom lens for APS-C DSLRs, offering a massive focal range suitable for everything from wide landscapes to distant wildlife. It incorporates Sigma's Optical Stabiliser (OS) to help prevent camera shake and a Hyper Sonic Motor (HSM) for fast, silent focusing. It is an ideal 'one-lens' solution for travel photographers who want to avoid frequent lens changes. When inspecting this model, pay attention to the stability of the OS system and ensure the zoom ring moves smoothly without tight spots. SDS checks for excessive play in the extended lens barrel and verifies that the autofocus remains accurate at the 250mm telephoto end. We also look for any signs of dust ingress behind the front element, a common trait in long-ratio zooms.