Sigma 20mm f/1.4 DG DN Art Lens for Sony E-Mount

The Sigma 20mm f/1.4 DG DN Art is a professional ultra-wide prime lens designed for full-frame Sony E-mount mirrorless cameras. With a blazing f/1.4 maximum aperture, class-leading sagittal coma flare control, an 82mm front filter thread, and a rear sheet filter holder, it's the ultimate Sony E-mount astrophotography lens — and an exceptional choice for landscape, architecture, and low-light photography.

Key Features

• f/1.4 maximum aperture for exceptional low-light performance and creative depth of field control
• Optimised for astrophotography — extremely well-controlled sagittal coma flare delivers pin-point stars from edge to edge
• Concave double-sided aspherical element for outstanding corner-to-corner sharpness across the full frame
• 2x SLD + 3x Aspherical elements correct chromatic aberrations, control distortion, and limit vignetting throughout the focus range
• MFL (Manual Focus Lock) switch locks focus ring position — essential for long astrophotography sessions in the dark
• 82mm front filter thread + rear sheet filter holder — rare on ultra-wide primes; curved front lip retains optional lens heater
• STM stepping motor AF — fast, near-silent autofocus; compatible with AF Assist on select Sony E-mount cameras

Technical Specifications

• Focal Length: 20mm
• Maximum Aperture: f/1.4
• Lens Mount: Sony E (full-frame; 30mm equivalent on APS-C)
• Optical Design: 2x SLD, 3x Aspherical (incl. 1x concave double-sided aspherical)
• Coating: Super Multi-Layer Coating
• Autofocus: STM stepping motor (inner focus)
• Diaphragm Blades: 11 (rounded)
• Minimum Focus Distance: 27cm
• Filter Thread: 82mm (front); rear sheet filter holder included
• Weight: Approx. 630g
• Weather Sealing: Dust- and splash-resistant
• Mount: High-precision brass bayonet

What's in the Box

• Sigma 20mm f/1.4 DG DN Art Lens (Sony E-mount)
• Front and rear lens caps
• Petal-shaped lens hood
• Rear sheet filter holder
• Lens case

Why Buy from Foto Discount World

• Authorised Sigma dealer in South Africa
• Competitive tax-inclusive ZAR pricing
• Usually ships in 5–7 working days — call 012 548 5651 or email sales@fotodiscountworld.co.za to confirm availability
• Expert advice from a team passionate about photography
• Trusted by Sony E-mount photographers across South Africa