The Sigma 14mm f/1.4 DG DN Art Lens for Sony E is a full-frame ultra-wide-angle prime lens designed for astrophotography and other low-light photography applications. Here's a breakdown of its key features:   

Key Features:

Ultra-wide 14mm focal length: This provides a vast 114° angle of view on full-frame cameras, capturing expansive landscapes and dramatic night skies.

Fast f/1.4 maximum aperture: This allows for exceptional low-light performance, capturing sharp images even in dim lighting conditions. It also enables shallow depth of field for creative bokeh effects.   

Sigma 14mm f/1.4 DG DN Art Lens for Sony E capturing a photo with shallow depth of field

Outstanding optical performance: The lens features 19 elements in 15 groups, including one SLD glass element, three FLD glass elements, and four aspherical lens elements. This sophisticated design minimizes aberrations and delivers exceptional image quality across the entire frame.   

High-speed autofocus: The lens utilizes a High-response Linear Actuator (HLA) linear motor for fast and accurate autofocus, making it suitable for capturing fast-moving subjects.   

Weather-sealed construction: The lens is dust and splash resistant, allowing you to use it in challenging weather conditions.   

Additional features: The lens includes a detachable tripod socket, a locking front cap with filter storage slots, a rear filter holder, and an aperture ring with a de-click function for smooth aperture adjustments during video recording.