Sigma 500mm F5.6 DG DN OS Sports

The Sigma 500mm F5.6 DG DN OS Sports is a full-frame telephoto prime for distant subjects. It comes in Sony E and Leica L mount versions, so choose the one made for your camera. Released in 2024, it remains in production.

Wildlife, birds and outdoor sport suit it best, because 500mm makes a wary or distant subject large in the frame. The main trade-off is a fixed focal length with no zoom, paired with a maximum aperture of F5.6. In return, the lens weighs just 3 lb 0.1 oz (1365 g), light enough to carry on long field sessions.

The barrel measures 4.25 in (108 mm) across and 9.29 in (236 mm) long, substantial but manageable for a 500mm telephoto. A screw-in filter must match the 95mm front thread directly. Filters in that size are less common than standard sizes, so plan ahead if you use polarisers or ND filters.

A 500mm prime frames subjects that keep their distance. Perched birds, mammals across open ground and players at the far end of a pitch all become usable sizes in the frame. There is no zoom, so you compose by choosing your position and crop later when the subject stays small.

F5.6 is the widest setting, and that shapes how you shoot. Wildlife is often most active in early and late light, when you may need higher ISO to keep shutter speeds fast enough at 500mm. In bright conditions the aperture is much less of a constraint.

Depth of field stays shallow at this focal length even at F5.6. A watched animal separates from grass, water or spectators behind it. The 11 aperture blades help keep the opening round when you stop down, smoothing out-of-focus areas.

Close focus sits at 10.5 ft (320 cm), close enough for an approachable bird or a subject near a hide. Maximum magnification reaches 0.17x, which suits portraits of larger animals.

The built-in stabilisation steadies the camera at 500mm, where even slight body movement would otherwise blur the image. For static subjects it allows slower handheld shutter speeds than you could otherwise hold.

It also settles the viewfinder view, which helps you keep a moving bird or player within the framing. It cannot freeze a running subject, so fast shutter speeds still matter for action.

Weather sealing protects the interior against dust and moisture. That matters for the shorelines, wetlands and dusty tracks where long-lens work often happens. A fluorine coating repels water and oil, so rain droplets and fingerprints wipe away more easily between shots.

The optical design has 20 elements in 14 groups. Five of the elements use low-dispersion glass, which helps reduce chromatic aberration. Chromatic aberration makes colours focus at different points and form coloured fringes along high-contrast edges. A bird against a bright sky is one place those fringes can show.

Internal focusing moves glass inside the barrel, so the lens keeps a constant length while focusing.