SIGMA 20mm

Sigma 20mm f/1.4 DG HSM Art is a landmark lens in the photography world, notable for being the first ultra-wide-angle lens to achieve a maximum aperture of f/1.4. Designed for full-frame DSLRs (Canon EF mount), it sits within Sigma’s “Art” line, which prioritizes optical excellence and creative expression over compact size.

Key Features and Benefits

World-First Aperture: The f/1.4 brightness at a 20mm focal length is ideal for astrophotography, allowing for pinpoint stars and low-light shooting without high ISO noise.

Advanced Optical Design: Features 15 elements in 11 groups, including two FLD (“F” Low Dispersion) and five SLD (Special Low Dispersion) elements to virtually eliminate chromatic aberration and distortion.

Hyper Sonic Motor (HSM): Provides fast, quiet, and snappy autofocus with full-time manual focus override for precise adjustments.

Premium Build Quality: Constructed with Thermally Stable Composite (TSC) material and a brass bayonet mount, ensuring durability across varying temperatures.

Artistic Bokeh: A rounded 9-blade diaphragm produces smooth, natural background blur, which is rare for such a wide-angle lens.

USB Dock Compatibility: Allows for firmware updates and micro-adjustments to the autofocus calibration to suit specific camera bodies.

Important Considerations
Bulbous Front Element: The curved front glass prevents the use of standard screw-on filters and requires a specialized adapter for filter systems.

Fixed Lens Hood: The petal-style hood is built-in to protect the front element and reduce flare.

Weight: At approximately 950g (2.1 lbs), it is a substantial lens that may feel front-heavy on smaller camera bodies.