This lens is designed to deliver a 180° field of view coupled with a rapid F1.4 aperture, making it versatile for various photographic needs, including astrophotography, landscapes, architecture, and some action sports.

Optical Design and Construction

The company emphasizes that the new lens benefits from an advanced optical design that effectively minimizes different types of aberrations. This ensures that images maintain high resolution across the frame, even at the widest aperture setting. The construction of the lens includes 21 elements arranged in 15 groups. This arrangement features four FLD and three SLD glass elements known for their low dispersion, alongside two aspherical lens elements. The lens also incorporates 11 aperture blades for smooth bokeh.

Physical Features and Functionality

The physical dimensions of the lens are noted as 104 x 157.9mm (4.1 x 6.2 inches), and it has a weight of 1,360 grams (48 ounces), tripod foot included. A notable feature is the inclusion of an MFL switch, which, when set to “LOCK,” disables the focus ring to prevent accidental adjustments after focus is achieved. Additionally, the lens supports customization through an AFL button, allowing users to assign a function of their choice. It is also designed to be dust and splash-resistant, enhancing its durability for use in various environments.

News source: https://www.sigma-global.com/en/lenses/a024_15_14/