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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 Sigma’s acclaimed I Series, it’s 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 Sigma’s 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 Sigma’s latest I Series lineup, this lens now features laser-engraved markings and a refreshed product line badge for a sleek, modern look. It’s also available in both classic black and matching silver finishes to pair with Sigma’s 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.