Sigma 28-70mm F/2.8 DG DN | C

This Sigma standard zoom suits full-frame mirrorless cameras in Leica L and Sony E mounts. The 28–70mm span takes you from wide scenes to short telephoto framing. That makes it a natural fit for travel, events, and portraits of family and friends.

The constant f/2.8 aperture works at every focal length, so you keep the same light-gathering ability as you zoom. The trade-off for the light, compact body is a plain feature set. There is no built-in stabilisation and no zoom lock. Sigma has made this lens since 2021, and it remains in production.

It weighs 1 lb 0.6 oz (470 g), so it stays comfortable on the camera for a full day of walking and shooting. The Leica L version runs 4 in (101.5 mm) long and 2.84 in (72.2 mm) wide. Screw-in filters fit the 67mm thread on the front. Its physical score is 93.

The 28–70mm range handles the everyday framing most photographers reach for. At 28mm you can take in rooms, tables of people, and streets. At 70mm you can tighten on a face or isolate a detail without changing your position. Between the two ends, the middle of the range gives a natural perspective for casual portraits and documentary shots. The 28mm short end is modest by wide-angle standards, so cramped interiors may still ask for a wider lens.

The f/2.8 maximum aperture stays available through the whole zoom, so dim interiors and evening events stay workable. It also gives you a consistent exposure as you zoom, which saves adjusting settings mid-shoot. Wide open at 70mm, f/2.8 gives enough subject separation for portraits with softly blurred backgrounds. In dim rooms, the wide aperture keeps shutter speeds usable without raising ISO as far.

Nine aperture blades influence how out-of-focus highlights render behind a portrait subject. The lens also focuses as close as 0.6 ft (19 cm). That lets you fill the frame with flowers, food, or objects on a table from a short working distance.

There is no stabilisation built into the lens. You will need a steady hold or camera-body stabilisation in dim light. Its features score is 52. There is also no zoom lock, so the barrel will not hold itself at a chosen focal length.

Weather sealing guards the joins against dust and moisture, which suits outdoor events and travel. A fluorine coating on the front element repels water and oil, so fingerprints and drizzle wipe away easily. Together they make the lens easier to live with on long shooting days outside.

The lens focuses internally, so the outer barrel does not extend while you focus. The Leica L version combines aspherical elements with low-dispersion glass. Aspherical surfaces help correct distortion and spherical aberration. Distortion makes straight edges appear curved, so this correction matters when you photograph buildings or interiors. Low-dispersion glass helps reduce colour fringes along high-contrast edges, such as a window frame against a bright sky.