Photo: TAKA@P.P.R.S (CC BY-SA 2.0)
Quick answer
The Sigma 120-400mm f/4.5-5.6 DG OS HSM APO is a short telephoto to super telephoto telephoto zoom lens covering 120-400mm at f/4.5 for the Sigma SA mount. Its smaller maximum aperture favours daylight shooting and keeps the lens compact.
About this lens
The Sigma 120-400mm f/4.5-5.6 DG OS HSM APO is a full-frame telephoto zoom lens covering 120-400mm at f/4.5-5.6 for Sigma SA mount cameras, with Optical Stabilizer, Hyper Sonic Motor autofocus and apochromatic correction. The range suits sports, wildlife, events and portraits.
Sigma 120-400mm f/4.5-5.6 DG OS HSM APO specifications
- Brand
- Sigma
- Mount
- Sigma SA
- Focal length
- 120-400mm
- Maximum aperture
- f/4.5
- Lens type
- Telephoto Zoom
What can you shoot with the Sigma 120-400mm f/4.5-5.6 DG OS HSM APO?
At 120-400mm this is a short telephoto to super telephoto telephoto zoom, which typically suits:
- Portraits with a flattering perspective
- Events and weddings
- Isolating subjects from the background
- Sports and action
- Wildlife and birds at moderate distance
Its smaller maximum aperture favours daylight shooting and keeps the lens compact.
Full-frame equivalent and field of view
Calculated from the focal length and crop factor. Not measured.
| Sensor | Crop | Equivalent | Horizontal FOV | Diagonal FOV |
|---|---|---|---|---|
| Full frame | 1.0x | 120–400mm | 5.2–17.1° | 6.2–20.4° |
| APS-C | 1.5x | 180–600mm | 3.4–11.4° | 4.1–13.7° |
Frequently asked questions
What mount does the Sigma 120-400mm f/4.5-5.6 DG OS HSM APO use?
It uses the Sigma SA mount, so it fits Sigma SA cameras directly.
What is the focal length of the Sigma 120-400mm f/4.5-5.6 DG OS HSM APO?
It zooms across 120-400mm with a maximum aperture of f/4.5. That makes it a short telephoto to super telephoto lens.
Is the Sigma 120-400mm f/4.5-5.6 DG OS HSM APO a prime or a zoom lens?
It is a zoom lens covering 120-400mm, so you can reframe without moving. Its maximum aperture is f/4.5.
What is the Sigma 120-400mm f/4.5-5.6 DG OS HSM APO equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 180–600mm on full frame, with a 3.4–11.4° horizontal and 4.1–13.7° diagonal field of view. These figures are calculated from the focal length and crop factor.
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