Sigma 300-600mm F4 DG OS Sports

This Sigma telephoto zoom covers 300–600mm with a constant f/4 maximum aperture on full-frame cameras. Sigma introduced it in 2025. Separate versions fit Sony E and Leica L cameras. Choose the mount that matches your camera.

The range suits distant wildlife and outdoor sport. You can change framing as action moves without changing lenses. The main trade-off is size and weight. Plan how you will carry and support the camera and lens during long sessions beside a pitch or at a wildlife hide.

The Sony E version weighs 8 lb 12 oz (3970 g) and measures 18.5 in (469.9 mm) long and 6.57 in (167 mm) across. The L version differs slightly in weight and length. A monopod or tripod can take the load during long waits. The lens uses a rear drop-in filter holder instead of a front screw-in thread. Keep the front glass covered during transport. Check that the support is secure before releasing your grip.

At 600mm, a distant bird or player appears larger than at 300mm from the same position. How much of the frame it fills still depends on distance. The shorter setting helps you locate action before tightening the framing. A large nearby subject may need a wider lens.

The maximum aperture remains f/4 as you zoom. You can retain that opening when framing changes, though a different part of the scene may need a different exposure. Under floodlights or at dusk, f/4 gives more room for a faster shutter speed than a smaller opening.

A nearby subject can have a thin zone of sharp focus at f/4. A background far behind it can become soft. Focus on the eye that matters most, then stop down when several animals at different distances need to stay sharp.

Closest focus is 9.2 ft (280 cm) at 300mm, measured from the sensor. The minimum distance is longer at 600mm. Maximum magnification reaches 0.17x at an intermediate zoom setting. These limits do not determine a suitable approach distance for wildlife. Leave animals enough space.

Dust and moisture resistance help outdoors. Use cover in persistent rain. A water and oil repellent coating helps marks wipe away from the front glass. Remove loose grit before cleaning, especially after working beside a dusty track.

Optical stabilization reduces camera shake and steadies the view at long settings. It helps with still subjects at slower shutter speeds. A running animal or flying bird still needs enough shutter speed for its movement. Firm support remains useful for long exposures.

Internal zoom keeps the barrel length unchanged as you alter framing. There is no zoom lock switch.

Six FLD elements and one SLD element help reduce coloured fringes along high-contrast edges, such as a heron against bright water. Internal focusing keeps barrel length unchanged while focus moves.