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

Nikon F (DX/FX)

Review

The Sigma 17-50mm F2.8 EX DC OS HSM is a versatile and reliable zoom lens designed specifically for Nikon F-mount cameras, particularly those with a DX sensor. With a constant maximum aperture of f/2.8 throughout the zoom range, this lens is an excellent choice for various photography styles, from landscapes to portraits.

Build Quality and Design

The lens boasts a solid build quality, which is typical of Sigma's EX line. The exterior is constructed from durable materials that can withstand regular use, making it suitable for both amateur and professional photographers. It features a smooth zoom mechanism, and the focus ring operates effortlessly, offering a tactile feel for precise adjustments. The lens is also equipped with Optical Stabilization (OS), which assists in reducing camera shake—particularly useful when shooting in low-light conditions or at longer focal lengths.

Optical Performance

In terms of optical performance, the Sigma 17-50mm offers impressive sharpness across the entire frame. From 17mm to 50mm, images remain crisp, with minimal distortion and chromatic aberration. The lens includes aspherical and special low dispersion elements, which help in vectoring control over color fringing and enhance overall image quality. However, it's worth noting that some users report a slight decrease in sharpness at the extreme corners, especially when shooting wide open at f/2.8.

The vibrant color rendition and excellent contrast produced by this lens make it a great option for landscape photography, where clarity and color play a crucial role. Additionally, the bokeh is pleasing, allowing for smooth transitions that are particularly advantageous when isolating subjects.

Autofocus Performance

The HSM (Hypersonic Motor) autofocus system is fast, accurate, and relatively quiet, making it suitable for both still photography and video work. The ability to achieve focus quickly is an advantage, especially in dynamic situations. However, there can be an occasional hunting effect in low-light scenarios or when photographing subjects with lower contrast.

Compatibility and Use Cases

Being a DX lens, the Sigma 17-50mm is designed to be used with Nikon’s APS-C format cameras, offering an effective focal length equivalent of approximately 26-75mm due to the crop factor. This range is ideal for everyday shooting, portraits, and general-purpose photography, ensuring that you won't have to switch lenses frequently in varying situations.

Pros and Cons

Pros

• Constant f/2.8 aperture throughout the zoom range
• Excellent sharpness and color rendition
• Good build quality and usability
• Effective Optical Stabilization (OS)
• Fast and relatively quiet autofocus

Cons

• Slightly reduced sharpness at extreme corners when wide open
• Autofocus may hunt in low-light situations

Verdict

Overall, the Sigma 17-50mm F2.8 EX DC OS HSM is an outstanding lens that delivers solid optical performance and versatility for Nikon DX users. Its combination of a constant f/2.8 aperture, good build quality, and effective stabilization makes it a valuable addition to any photographer's kit. While it has minor shortcomings, they are easily outweighed by the benefits, making it a worthwhile investment for those looking to enhance their photography experience.