The Sigma 24-70mm f/2.8 DG DN Art and the Tamron 28-75mm f/2.8 Di III are both fast standard zooms for full-frame mirrorless cameras. The Sigma opens wider at 24mm and sits in the maker’s Art line, while the Tamron is known for a more compact, lighter approach and a slightly longer reach. Choose by whether wide coverage or portability matters more to you.
What each lens is for
Both lenses are everyday workhorses for portraits, events, weddings, street photography, travel and video. A constant f/2.8 aperture keeps exposure steady across the zoom and gives usable background blur at the long end.
The Sigma belongs to the Art line, which the maker aims at demanding image quality and a robust build. The Tamron is a Di III lens built for mirrorless, with a design focus on keeping the size down for people who carry a camera all day.
Key differences
| Trait | Sigma 24-70mm f/2.8 | Tamron 28-75mm f/2.8 |
|---|---|---|
| Wide end | 24mm | 28mm |
| Long end | 70mm | 75mm |
| Maximum aperture | f/2.8 constant | f/2.8 constant |
| Design emphasis | Art-line build | Compact and light |
Check each maker’s page for exact size, weight, filter thread, mounts and the generation of each lens.
24mm versus 28mm
The step from 28mm to 24mm is small on paper but noticeable in practice. At 24mm you can fit more of a room, a building or a group of people in the frame, and landscapes feel more expansive. At 28mm the view is calmer and closer to what many street photographers favor.
At the long end, 75mm is a hair tighter than 70mm, which helps slightly with head-and-shoulders portraits but is not a large change.
How to decide
- Choose the 24mm lens if you shoot interiors, real estate, events in tight rooms or landscapes.
- Choose the compact lens if you carry gear on long days, travel by plane or use a small gimbal for video.
- Confirm that the version you want is offered for your mount.
- Think about the rest of your kit and whether you already own a wide-angle prime or zoom.
One more point is filters and accessories. If you use filters, check the thread size on each lens so you can reuse what you own. A shared thread size across your lenses saves money and time in the field, and a smaller front element often means smaller, lighter filters.
FAQ
Is a smaller lens always better for travel?
Not always. A smaller lens is easier to carry, but if it lacks the focal length you need you may end up carrying a second one.
Do both lenses give similar background blur?
At the same aperture and similar focal lengths, the blur is very similar. Subject distance matters more than the lens brand.
The Short Version
Choose the Sigma if you want the wider 24mm view and an Art-line build. Choose the Tamron if a lighter, more compact lens suits the way you carry and shoot. Check the maker pages for mount availability and exact specifications.
