Sigma AF 20mm f/2 DG DN I Contemporary Lens For Sony E-Mount and L-Mount Mirrorless Cameras

Ultra-wide. Ultra-bright. Ultra-portable.

The Sigma AF 20mm f/2 DG DN I Contemporary Lens is a premium wide-angle prime lens designed for full-frame mirrorless cameras. Combining an ultra-wide 20mm focal length with a fast f/2 aperture, this compact lens delivers stunning image quality in a sleek, travel-friendly form. Part of Sigmas acclaimed I Series, its the ideal tool for photographers and content creators seeking sharpness, control, and creative flexibility.

Available for both Sony E-mount and L-mount systems.

Fast, Bright f/2 Aperture for Low-Light & Creative Depth

Perfect for shooting in low-light conditions, the wide f/2 maximum aperture allows more light into the lens, helping you capture beautifully exposed images even at dusk or indoors. The 9-blade rounded diaphragm produces soft, natural-looking bokeh, making it an excellent option for astrophotography, environmental portraits, and artistic wide-angle work.

Whether you’re capturing the Milky Way, shooting dramatic architecture, or composing wide-angle wedding scenes, this lens offers incredible depth and control.

Compact Design with Premium Build Quality

Weighing just 370g and measuring only 72.4mm in length, the Sigma 20mm f/2 DG DN I is built for portability without compromising performance. It’s part of Sigmas Contemporary line, known for its balance of high-end optical quality and everyday usability.

The solid all-metal body features precision-machined aluminium components, including tactile aperture and focus rings that deliver a premium handling experience. This is a lens built to perform and built to last.

Advanced Optical Performance

Inside, the lens features an optical construction of 13 elements in 11 groups, including:

• 1 FLD (F Low Dispersion) element

• 1 SLD (Special Low Dispersion) element

• 3 aspherical elements

This sophisticated design effectively suppresses optical aberrations such as distortion, chromatic aberration, and sagittal coma flare crucial for rendering pinpoint stars in astrophotography and edge-to-edge sharpness in landscape work.

To reduce ghosting and flare, even in strong backlight, Sigma applies both Super Multi-Layer Coating and Nano Porous Coating (NPC), helping deliver crisp, high-contrast images in any lighting condition.

Fast, Quiet Autofocus

Featuring a stepping motor and internal focusing system, the lens delivers smooth, silent, and highly responsive autofocus perfect for both stills and video. It also supports AF, MF, and DMF (Direct Manual Focus), allowing full control for those critical focus adjustments in demanding scenes.

Weather-Sealed for Outdoor Shoots

The lens mount is fitted with weather-resistant sealing, giving you the confidence to shoot in unpredictable outdoor conditions ideal for landscape and travel photography.

Refined I Series Updates

Part of Sigmas latest I Series lineup, this lens now features laser-engraved markings and a refreshed product line badge for a sleek, modern look. Its also available in both classic black and matching silver finishes to pair with Sigmas stylish FP cameras.

Key Features

• Ultra-wide 20mm focal length perfect for landscapes, interiors, and astrophotography

• Fast f/2 aperture with beautiful bokeh and low-light performance

• Premium I Series design compact, lightweight, and robust

• High-performance optics 13 elements in 11 groups with FLD, SLD & aspherical glass

• Nano Porous Coating (NPC) & Super Multi-Layer Coating for superior contrast

• Smooth, silent autofocus with stepping motor

• Manual aperture ring with click stops

• Weather-sealed mount for outdoor reliability

• Available for Sony E-mount and L-Mount mirrorless systems

What’s in the Box?

• Sigma AF 20mm f/2 DG DN I Contemporary Lens

• Magnetic Metal Front Cap

• Standard Plastic Front Cap

• Petal-Type Lens Hood

• Rear Lens Cap

• Protective Lens Pouch

The Sigma AF 20mm f/2 DG DN I Contemporary is a high-performance wide-angle prime that punches well above its weight. Whether you’re capturing cityscapes, cosmic skies, or cinematic scenes, this lens offers premium optical performance in a beautifully compact design built to go wherever your vision takes you.