The SIGMA 20mm F1.4 DG DN | Art lens is engineered specifically for full-frame mirrorless cameras, offering exceptional optical performance and versatility for a range of photographic applications, particularly astrophotography. Here’s a detailed overview of its features and specifications:

Key Features

Ultra-Wide Angle: With a focal length of 20mm, this lens provides a wide field of view (94.5°), making it ideal for landscape and architectural photography.

Bright Aperture: The maximum aperture of F1.4 allows for excellent low-light performance and depth of field control, enabling stunning images even in challenging lighting conditions.

Optical Quality: Comprising 17 elements in 15 groups, including two Special Low Dispersion (SLD) elements and three aspherical elements, the lens minimizes optical aberrations such as coma and distortion, ensuring sharpness from the center to the edges.

Astrophotography Focused: Designed with astrophotographers in mind, it captures stars as precise points of light, making it a top choice for night sky photography.

Filter Compatibility: The lens features a front filter thread (82mm) and a rear filter holder, allowing for the use of various filters without compromising image quality.

User-Friendly Features: Includes a Manual Focus Lock (MFL) switch to prevent accidental focus changes and a lens heater retainer to avoid condensation during cold shoots