The Sigma 120-400mm f/4.5-5.6 APO DG OS HSM is a versatile telephoto zoom for Nikon F mount, covering a 120–400mm focal range with built-in optical stabilisation, HSM autofocus, and a 77mm filter thread — making it a practical used option for wildlife, sports and travel photographers who need reach without switching lenses.
Key Specifications
- Focal length: 120–400mm
- Maximum aperture: f/4.5 (wide) – f/5.6 (tele)
- Minimum aperture: f/22
- Image stabilisation: Yes (OS)
- Autofocus: Yes (HSM — Hypersonic Motor)
- Minimum focus distance: 1.5 m
- Filter thread: 77 mm
- Aperture blades: 9
- Weight: 1,750 g
- Mount: Nikon F
Who is the Sigma 120-400mm f/4.5-5.6 APO DG OS HSM for?
This lens is built for photographers who need serious reach on a DSLR without paying prime-lens prices. Wildlife shooters get 400mm to fill the frame with distant subjects, while the 120mm end keeps the lens useful when action moves closer — no need to swap glass mid-session. Sports photographers benefit from the HSM drive, which is quiet and fast enough for most action scenarios. The OS stabilisation helps when you're shooting handheld at the longer end, especially in lower light at golden hour or during overcast conditions.
The APO DG designation matters for buyers: APO (apochromatic) means the design incorporates three SLD (Special Low Dispersion) glass elements to control chromatic aberration across the zoom range, while DG confirms full-frame compatibility — the lens works on both full-frame and APS-C Nikon F bodies. On a crop sensor you're effectively pushing towards 600mm equivalent reach — great for birds in flight or motorsport from the stands. Super multi-layer coating reduces flare and ghosting, and the rear-focus system contributes to consistent image quality throughout the zoom range. At 1,750 g it's not a walk-around lens, but paired with a monopod it becomes very manageable for a full day's shooting. If you're considering alternatives, the Nikon AF-S NIKKOR 80-400mm f/4.5-5.6G ED VR covers a similar range with the native Nikon mount advantage, and the Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary is worth comparing if you regularly need that extra reach beyond 400mm.
Buying a used Sigma 120-400mm
Picking up this lens second-hand makes a lot of sense — it's a heavy-duty zoom built for outdoor use, so pre-owned copies tend to be well-worn cosmetically but mechanically solid. At Camera-tweedehands.nl, every lens is hand-inspected for smooth zoom and focus operation, clear optics, and absence of fungus or internal haze. We verify mechanical function of the OS and HSM switches and document our findings in a detailed inspection report. Every used lens comes with a minimum of 12 months warranty, so you're not buying blind. A used copy of the Sigma 120-400mm OS HSM delivers excellent telephoto reach at a strong value compared to buying new, making it one of the more accessible long-zoom options for Nikon F shooters.
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