Sigma constant f/3.5 ultra-wide for Nikon (duplicate), 15mm equivalent with HSM at mid-range pricing.
The Sigma 10-20mm f/3.5 EX DC HSM for Nikon F is a duplicate listing of the constant-aperture APS-C ultra-wide previously enriched as ID 3397/3239. The constant f/3.5 provides brighter ultra-wide coverage than variable-aperture alternatives for landscapes and architecture on Nikon DX.
The specification matches previously enriched listings — constant f/3.5, HSM quiet AF, and 16mm equivalent dramatic perspectives on APS-C. The constant aperture provides genuine practical advantages for astrophotography and consistent wide-angle exposure.
Build quality is Sigma EX premium tier with the same quality construction. The constant aperture and HSM motor provide the same advantages as previous listings of this lens.
This duplicate provides the same constant f/3.5 ultra-wide as previously enriched Sigma 10-20mm listings. The constant aperture remains a genuine advantage above variable-aperture alternatives.