Versatile Sigma standard zoom covering 17-70mm with f/2.8 wide end for Nikon APS-C.
The Sigma 17-70mm f/2.8-4.5 DC is a versatile standard zoom for Nikon F mount APS-C cameras, covering a useful 25.5-105mm equivalent range with a fast f/2.8 wide end. The extended telephoto reach to 70mm provides more versatility than standard 17-50mm zooms, making it a practical one-lens travel solution.
Optical quality is respectable with good centre sharpness across the range and the f/2.8 wide-angle end providing useful speed for low-light and indoor shooting. The variable aperture narrows to f/4.5 at 70mm, which is a reasonable trade-off for the extended range. Performance is best at moderate apertures around f/5.6 to f/8.
Build quality is solid with Sigma's quality standards and a compact form factor that keeps the lens manageable on smaller Nikon DX bodies. The zoom and focus rings operate smoothly. The lens is lightweight enough for all-day carry without fatigue, which is important for a lens designed as a versatile everyday companion.
On the used market, the Sigma 17-70mm f/2.8-4.5 offers a versatile all-in-one zoom at very affordable prices. For Nikon APS-C shooters wanting more reach than a 17-50mm without carrying a second lens, it provides a practical balance of zoom range, aperture speed, and compact dimensions.