Sigma 300mm f/2.8 EX APO DG HSM - Sigma SA, Nikon F, Canon EF, Sony A, Pentax K Mount

The Sigma 300mm f/2.8 EX APO DG HSM is a professional-grade super-telephoto prime featuring a fast f/2.8 aperture, ideal for sports and wildlife photography. The 'EX' designation signifies Sigma's former premium build quality, while the 'DG' indicates coatings optimised for digital sensors. It includes a drop-in filter holder at the rear and a dedicated tripod collar for balanced handling on a support system. When sourcing a used 300mm f/2.8, pay close attention to the autofocus speed and the condition of the drop-in filter assembly. Older EX coatings can sometimes show 'peeling' on the barrel, though this is cosmetic. SDS ensures the HSM motor is silent and functional, the tripod foot locks securely, and the internal optics are clear of the haze sometimes found in older large-aperture telephotos.