Sigma 28-70mm f/2.8 DG DN C (Contemporary) Full-Frame Autofocus Lens for Leica L-Mount, Black {67}

Sigma's lightest f/2.8 standard zoom built for mirrorless full-frame.

At 470g and 101.5mm long, this 28-70mm f/2.8 sits in a different weight class than the 24-70mm zooms it competes against. Sigma achieved that by trimming 4mm from the wide end, which allowed a smaller optical formula: 16 elements across 12 groups, with a single lightweight focusing element keeping the AF unit compact. The stepping motor is quiet and fast, which matters as much for video shooters as it does for anyone working events where a loud focus hunt draws attention.

The optical correction work is thorough. A pair of FLD glass elements handles chromatic aberration at the high-dispersion end of the spectrum, two SLD elements address secondary color fringing, and three aspherical elements keep field curvature and distortion in check across the 75.4° to 34.3° angle-of-view range. The 67mm filter thread is a practical size, and the 19cm minimum focusing distance gives you real working room at the short end.

For Leica SL or Panasonic S-series shooters who find the Art-line 24-70mm too heavy for day-long work, this lens makes the trade-off concrete: you give up 4mm at the wide end and get back a lens you'll actually carry.

Who It's For

Travel photographers keeping pack weight disciplined will appreciate that a constant f/2.8 zoom comes in at just 470g without sacrificing full-frame coverage. Documentary and street shooters benefit from the stepping motor's near-silent AF, which keeps the lens unobtrusive during candid work. Video operators running gimbals get a lightweight, balanced option that autofocuses quietly and doesn't fight stabilization rigs. Portrait photographers working the 50-70mm end gain meaningful subject separation at f/2.8 with solid aberration control from the FLD and aspherical elements.

Key Features

• 28-70mm f/2.8 constant aperture with L-mount full-frame coverage
• 470g weight and 101.5mm length, smallest and lightest in its class
• Two FLD and two SLD low-dispersion elements for color accuracy
• Three aspherical elements reduce field curvature and distortion
• Single lightweight focusing element with quiet stepping motor
• 19cm minimum focus distance with 67mm filter thread

FAQ

How does this 28-70mm compare weight-wise to the Sigma 24-70mm f/2.8 Art?

This lens is 470g versus the Art's roughly 680g-that's a 210g difference, achieved by dropping the 4mm wide end and using a simpler optical formula with a single lightweight focusing element.

Is autofocus silent for video work?

The stepping motor is quiet and fast, designed specifically for video shooters and event work where focus noise matters.

What's the minimum focus distance at 28mm?

19cm (7.5"), giving you real working room for close-range compositions at the wide end.

Does it have image stabilization?

No, this lens has no built-in stabilization. Stabilization depends on your camera body.

What aberration control does the optical design include?

Two FLD elements for high-dispersion chromatic aberration, two SLD elements for secondary color fringing, and three aspherical elements for field curvature and distortion across the full zoom range.

What filter size does it accept?

67mm, a practical standard thread size that works with most filter collections.

Is this lens optimized for Panasonic S-series cameras too?

Yes, both Leica SL and Panasonic S-series cameras use the L-mount, so this lens works on either platform.