Best Sigma Lenses in 2026

Its defining characteristic is the full 180-degree circular image it projects onto full-frame sensors, creating a distinctive, frame-filling fisheye effect. The use of SLD glass and a Super Multi-Layer coating ensures strong correction of chromatic aberration and effective flare suppression for clean image quality. This lens is best for experimental photographers and astrophotographers seeking a dedicated circular fisheye perspective, not a standard rectilinear wide-angle.

Its constant f/1.8 aperture across the 17-40mm zoom range on APS-C ensures consistent low-light performance, backed by an HLA autofocus motor and weather sealing. The included filter and cleaning kit adds practical value, while 4 SLD and 4 aspherical elements maintain edge-to-edge sharpness. Best for travel and street photographers who need a rugged, fast wide-to-standard zoom with reliable autofocus.