The Tamron 50-400mm f/4.5-6.3 Di III VC VXD and the Sigma 100-400mm f/5-6.3 DG DN OS Contemporary are two mirrorless telephoto zooms that reach 400mm. The Tamron adds a wide-to-standard range at the short end, while the Sigma focuses on the telephoto span alone. Choose the Tamron for versatility and the Sigma for a purpose-built long zoom.
What Each Lens Is For
The Tamron 50-400mm is a long-range zoom intended to replace several lenses. At 50mm it handles general scenes, and at 400mm it reaches distant wildlife and sport. This helps travelers who want to avoid swapping lenses in dusty or crowded places.
The Sigma 100-400mm Contemporary belongs to Sigma’s lines for mirrorless bodies. It begins at 100mm, so it is a dedicated telephoto for birds, aircraft, motorsport and field sport, and it is often paired with a separate standard zoom.
Key Differences
| Trait | Tamron 50-400mm | Sigma 100-400mm |
|---|---|---|
| Short end | 50mm | 100mm |
| Long end | 400mm | 400mm |
| Aperture | f/4.5 to f/6.3 | f/5 to f/6.3 |
| Idea | One lens for many situations | Dedicated telephoto zoom |
Both makers offer these lenses for specific mounts, and Sony E is a common one. Confirm the mount list, weight and dimensions on each page.
How to Decide
- Decide whether you want a single lens or a two-lens kit. Pairing the Sigma with a standard zoom covers a similar range.
- Check your mount. Availability differs by maker and by camera system.
- Compare handling. Zoom ring feel, tripod collar options and weight matter on long outings.
- Think about your typical light. Both lenses have modest maximum apertures at 400mm, so they favor daytime shooting.
Technique Tips for 400mm
- As general guidance, a shutter speed of roughly 1/800 or faster freezes most birds and running animals, and flying subjects may need more.
- Use continuous autofocus and burst shooting for moving subjects.
- Rest your elbows against your body, or use a monopod on longer outings.
These are rough guides, not rules.
Weight and Balance
Long zooms get tiring on a full day out. Look at the weight on each maker’s page, and consider whether you will use a strap, a monopod or a tripod collar. A lens that balances well on your camera body is easier to hold steady, and that often matters more than a small difference in optical results.
FAQ
Does the Tamron’s extra 50mm range matter?
It matters if you want one lens for everything on a trip. If you already carry a standard zoom, the extra range adds little.
Are these good for video?
They can be used for it, but the modest apertures call for good light. Check autofocus and stabilization behavior on your camera.
The Short Version
Both reach 400mm, so the real question is what happens below 100mm. If you want that range in the same lens, choose the Tamron. If you prefer a dedicated telephoto and carry a separate zoom, choose the Sigma.
