Sigma's compact DX standard zoom — the 18-125mm OS HSM for Nikon with stabilisation.
The Sigma 18-125mm f/3.8-5.6 DC OS HSM is a compact APS-C standard zoom for Nikon F mount covering 27-188mm equivalent with OS stabilisation. It provides a useful range from wide-angle to moderate telephoto — more than a kit zoom but less than a superzoom — with good optical quality and the practical advantages of OS and HSM.
Optical performance is decent — better than extreme superzooms thanks to the more modest 7x zoom ratio. Centre sharpness is good throughout the range. OS stabilisation provides approximately 4 stops of correction. HSM motor is fast and quiet. The 27-188mm equivalent range covers most everyday situations without the extreme compromises of 18-200mm+ designs.
Nikon F mount, APS-C. Filter thread is 67mm. Weight is approximately 490 grams — moderate. Build quality is good. The 18-125mm range hits a practical sweet spot — more versatile than 18-55mm but optically better than 18-200mm or longer superzooms. No weather sealing. A sensible compromise between range and quality.
Available at reasonable prices. Check OS motor and AF function. A practical everyday zoom — the range is more useful than a kit zoom while the optics are better than a superzoom. The OS and HSM add genuine value. Best for photographers who want versatility without the extreme optical compromises of superzooms.