The Sony 70-300mm G OSS and the Sigma 100-400mm are both full-frame telephoto zooms for E-mount cameras that aim to keep size and weight reasonable. The Sigma reaches farther, up to 400mm, while the Sony begins wider at 70mm and is a little more flexible for general use. Choose the Sony for versatility and the Sigma for extra reach.
What Each Lens Offers
The Sony 70-300mm is a compact telephoto zoom. Its 70mm opening view makes it good for people and nearby scenes, and 300mm is enough for many animals and sports situations.
The Sigma 100-400mm gives a longer view at the top end. It is aimed at travellers, hikers and wildlife fans who want distance without the size of a 200-600mm lens.
Comparison at a Glance
| Trait | Sony 70-300 | Sigma 100-400 |
|---|---|---|
| Range | 70 to 300mm | 100 to 400mm |
| Near end | Wider, more flexible | Tighter |
| Long end | Shorter reach | Longer reach |
| Typical user | All-round and travel | Wildlife and distant subjects |
Confirm exact apertures, weights and filter sizes on each maker’s page, as figures vary by version.
Real-World Considerations
- Reach: 400mm is one third longer than 300mm, which makes a clear difference for small birds.
- Close subjects: 70mm lets you frame portraits and groups that 100mm will crop tightly.
- Size: both are designed to be carried. Compare their length when zoomed out, because that affects how they sit in a bag.
- Apertures: both narrow at the long end, so you need decent light or higher ISO.
- Cropping: a high-resolution body can bring a 300mm photo closer after the fact, narrowing the gap.
Who Should Choose Which
- Choose the Sony if you want a versatile travel zoom that also handles portraits and family events.
- Choose the Sigma if distant wildlife or sports is your main interest and you already cover the 70mm range with another lens.
- If you are unsure, ask what you miss most: width at the near end or reach at the far end.
A general baseline is a shutter speed of roughly 1/500 and faster at 300mm, and faster again at 400mm, adjusted for your stabilization.
Another factor is how you carry and handle the lens. Zoom rings, zoom lock switches, tripod feet and hood design all affect daily use, and they differ between makers. If you plan to use a monopod, check whether a tripod foot is included or sold separately. Spend a few minutes handling each lens, if you can, and notice which balances more comfortably on your body.
FAQ
Does the extra 100mm make a big difference?
For small or shy subjects, yes. For larger animals or events where you can get close, 300mm is usually sufficient.
Will either work on an APS-C camera?
Yes. Both fit E-mount bodies of either sensor size, with a tighter view on APS-C.
The Short Version
The Sony 70-300mm is the more flexible all-round telephoto. The Sigma 100-400mm is the longer-reaching option for wildlife and distance. Choose by which end of the range you use more often.
