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
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$377.40
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Lens Overview — Sigma DC 17-50mm f/2.8 OS HSM
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
| Spec | Detail |
|---|---|
| Use Cases | Portrait, Landscape, Travel, Product |
| Lens Type | Zoom |
| Format | APS-C |
| Zoom/Prime | Zoom |
| Focal Length | 17–50mm |
| Maximum Aperture | f/2.8 |
| Camera System | DSLR |
| Lens Mount | Canon EF, Nikon F, Sony A, Pentax K, Sigma SA |
| Autofocus | Yes |
| Focus Type | Auto, Manual |
| Image Stabilization | Optical |
| Filter Thread | 77mm |
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