Sigma's updated fast 28mm — the f/1.8D ASPH II with improved digital correction for Nikon.
The Sigma 28mm f/1.8D ASPH II is an updated version of Sigma's fast wide-angle prime for Nikon F mount. The ASPH II designation indicates an updated aspherical element for improved wide-open performance. At f/1.8 and 28mm, it provides fast wide-angle capability. The D-type coupling ensures Nikon metering compatibility.
Optical performance is decent — improved over the original with the updated aspherical element. Sharpness is respectable from f/1.8. The fast aperture enables creative shallow DOF at wide angle and low-light shooting. DG coatings for digital sensors. The Sigma 28mm f/1.4 Art is the dramatically improved modern alternative.
Nikon F mount with D-type coupling. Filter thread is 77mm. Weight is approximately 500 grams. Build quality is solid. HSM motor on some versions. No image stabilisation. The 77mm filter thread is large for a 28mm. The updated ASPH II element is the main improvement over the original.
Available at low prices. Check AF and smooth focus. Superseded by the much better Sigma 28mm f/1.4 Art. The ASPH II update improves wide-open performance modestly. Best at very low prices for budget fast wide-angle on Nikon F. The Art version is worth the significant quality improvement.