The SIGMA 40mm F1.4 DG HSM (A) for Sony E Mount is a premium wide-normal lens designed to deliver exceptional optical performance, particularly suited for both photography and videography. Below are its key features and specifications:

Key Features

Optical Design: The lens features a sophisticated optical layout with 16 elements in 12 groups, including three FLD (F Low Dispersion) and three SLD (Special Low Dispersion) glass elements, which effectively minimize chromatic aberrations and enhance overall image quality.

Aperture: With a maximum aperture of F1.4, this lens excels in low-light conditions and provides a shallow depth of field, resulting in soft, beautiful bokeh effects12. The rounded 9-blade diaphragm contributes to this aesthetic quality.

Distortion Control: The lens boasts a distortion level of less than 1%, ensuring straight lines remain intact, which is crucial for architectural and landscape photography.

Durability: Designed with a dust and splash-resistant structure, it is built to withstand various shooting environments. Additionally, the front element has a water and oil-repellent coating for ease of cleaning.

Autofocus System: Equipped with a Hyper Sonic Motor (HSM), the lens offers fast and silent autofocus, making it suitable for both still photography and video recording.

Compatibility: This lens is compatible with full-frame Sony E-mount cameras, making it versatile for various shooting styles, including portrait, landscape, and street photography.