Sigma 500mm f/4 DG OS HSM Sports - Canon EF, Nikon F, Sigma SA Mount

This professional super-telephoto lens is designed for demanding action and wildlife photography. The optical path includes two FLD and one SLD glass elements to control aberrations. It features a highly effective optical stabiliser with two modes and a customisable focus preset system. The lens barrel is constructed from magnesium alloy and is weather-sealed for use in adverse environments. Check the front element for scratches, as the large surface area is often exposed. The autofocus should be swift and the OS system should engage without excessive noise or 'jumping' in the viewfinder. SDS inspects the rear filter slot and verifies that the weather seals at the mount remain intact. The carbon fibre lens hood should be checked for cracks or damage to the thumb-screw locking mechanism.