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Sigma DC 17-50mm F2.8 EX OS HSM Lens

The Sigma DC 17-50mm f/2.8 OS HSM is a 17–50mm f/2.8 lens designed for Canon EF, Nikon F, Sony A, Pentax K, Sigma SA mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.

Sigma DC 17-50mm F2.8 EX OS HSM Lens

Sigma DC 17-50mm F2.8 EX OS HSM Lens

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Lens Overview — Sigma DC 17-50mm f/2.8 OS HSM

The Sigma DC 17-50mm f/2.8 EX OS HSM is a standard zoom lens built specifically for APS-C format DSLR cameras, covering a focal length range of 17mm to 50mm. One of its most practical attributes is the constant f/2.8 maximum aperture maintained throughout the entire zoom range, giving photographers consistent exposure and depth-of-field control whether shooting wide or zoomed in. The lens features optical image stabilization, which helps manage camera shake during handheld shooting.

Autofocus is supported alongside manual focus, giving users the flexibility to switch between focusing modes as their situation demands. With a filter thread size of 77mm, it accommodates commonly available filters for creative and protective use. The lens weighs 565g, which is reasonable for a constant-aperture standard zoom in this class.

Mount compatibility is notably broad, with versions available for Canon EF, Nikon F, Sony A, Pentax K, and Sigma SA camera systems, making it accessible to a wide range of DSLR shooters. This versatility across platforms, combined with the constant f/2.8 aperture and optical stabilization, makes it a solid option for APS-C DSLR users seeking a dependable standard zoom lens.

Key Features — Sigma DC 17-50mm f/2.8 OS HSM

Constant f/2.8 Aperture: Maintains f/2.8 throughout the entire 17–50mm zoom range, ensuring consistent exposure and depth-of-field control without adjustment as you zoom.

Optical Image Stabilization: Built-in OS system compensates for camera shake during handheld shooting, particularly useful in low light or at longer focal lengths.

HSM Autofocus Motor: Hyper Sonic Motor delivers fast, quiet autofocus with full-time manual focus override without switching out of AF mode.

APS-C Optimized Design: Engineered specifically for crop-sensor DSLRs, covering an equivalent focal range of approximately 27–80mm in full-frame terms.

17–50mm Zoom Range: Covers wide-angle through short telephoto in a single lens, suited for everyday shooting including interiors, portraits, and events.

77mm Filter Thread: Accepts widely available 77mm filters for polarizers, ND filters, and lens protection.

Lens Specifications — Sigma DC 17-50mm f/2.8 OS HSM

Sigma DC 17-50mm f/2.8 OS HSM full specifications
SpecDetail
Use CasesPortrait, Landscape, Travel, Product
Lens TypeZoom
FormatAPS-C
Zoom/PrimeZoom
Focal Length17–50mm
Maximum Aperturef/2.8
Camera SystemDSLR
Lens MountCanon EF, Nikon F, Sony A, Pentax K, Sigma SA
AutofocusYes
Focus TypeAuto, Manual
Image StabilizationOptical
Filter Thread77mm

Description — Sigma DC 17-50mm f/2.8 OS HSM

The Sigma DC 17-50mm f/2.8 EX OS HSM is a zoom lens designed for APS-C format DSLR cameras, covering a 17–50mm focal length range that spans wide-angle to short telephoto perspectives. The standout feature is its constant f/2.8 maximum aperture, which holds steady across the full zoom range — a significant advantage over variable-aperture alternatives when shooting in challenging light or when consistent depth of field is a priority. Optical image stabilization is built in to assist with handheld shooting, and the lens supports both auto and manual focus modes. The 77mm filter thread accommodates a wide range of available filters.

At 565g, the lens strikes a practical balance between build and portability for a constant-aperture standard zoom. Mount options include Canon EF, Nikon F, Sony A, Pentax K, and Sigma SA, making this lens accessible to photographers across multiple major DSLR platforms. It is classified as a standard focal length range zoom, suited to a variety of everyday shooting scenarios on crop-sensor bodies.

Pros — Sigma DC 17-50mm f/2.8 OS HSM

  • ✓Constant f/2.8 maximum aperture across the full 17–50mm zoom range provides consistent exposure control
  • ✓Optical image stabilization helps reduce camera shake during handheld shooting
  • ✓Both autofocus and manual focus modes are supported for flexible operation

Cons — Sigma DC 17-50mm f/2.8 OS HSM

  • ✗APS-C-only format means the lens cannot be used on full-frame DSLR bodies without vignetting
  • ✗At 565g, the lens adds meaningful weight to a camera kit, particularly for all-day shooting
  • ✗77mm filter size, while standard, means larger and potentially more expensive filters

Reviews — Sigma DC 17-50mm f/2.8 OS HSM

Videos — Sigma DC 17-50mm f/2.8 OS HSM

Sigma 17-50mm f/2.8 OS HSM lens review (with samples) — Christopher Frost

Resources & Downloads — Sigma DC 17-50mm f/2.8 OS HSM

Manuals & Guides

Frequently Asked Questions — Sigma DC 17-50mm f/2.8 OS HSM

Which camera mounts is this lens compatible with?+
The Sigma DC 17-50mm f/2.8 EX OS HSM is available in Canon EF, Nikon F, Sony A, Pentax K, and Sigma SA mounts. It is designed for APS-C format DSLR cameras, so users should confirm their specific body is an APS-C sensor model before purchasing.
Does this lens have image stabilization?+
Yes, the lens includes optical image stabilization. This helps counteract camera shake when shooting handheld, which can be especially useful in lower-light conditions or at longer focal lengths within the zoom range.
What is the maximum aperture, and does it change throughout the zoom range?+
The maximum aperture is a constant f/2.8 across the entire 17–50mm focal length range. This means you retain the same aperture setting whether shooting at 17mm or 50mm, which is beneficial for maintaining consistent exposure and background separation.
What filter size does this lens use?+
The lens has a 77mm filter thread. This is a common filter diameter, so compatible filters should be widely available from most filter manufacturers.
Can this lens be used on a full-frame DSLR camera?+
This lens is designed specifically for APS-C format cameras, as indicated by the 'DC' designation in its name and its lensFormat specification. Using it on a full-frame body is not its intended application and may result in image circle limitations.
Does the lens support manual focus?+
Yes, the lens supports both auto and manual focus modes. This gives photographers the ability to fine-tune focus manually when needed, in addition to relying on the autofocus system.

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