Sigma Corporation has expanded its lens range for full-frame mirrorless cameras with a new 14mm f/1.4 DG DN | Art lens, which has been designed primarily for astrophotography.
The new Sigma 14mm f/1.4 DG DN | Art lens. (Source: Sigma Corporation.)
The company claims it is the world’s widest f/1.4 single focal length lens – apart from special fisheye lenses. It will be available in Sony E- mount and Leica L-Mount versions. Special design features for astrophotography include a removable tripod socket, MFL switch (Manual Focus Lock function), lens heater retainer, rear filter holder and a specially-designed front cap that includes a new locking mechanism and new filter storage slots.
The optical design consists of 19 elements in 15 groups and includes one SLD glass element, three FLD glass elements and four aspherical lens elements, positioned to provide advanced aberration correction, particularly with respect to sagittal coma flare, which distorts the shape of stars. Ghosting and flare are also thoroughly addressed through both optical design and coatings. The body is dust and splash resistant, and the front element is coated with a water- and stain-repellent coating. The lens is built from lightweight materials such as polycarbonate TSC (Thermally Stable Composite), which has a thermal shrinkage rate equivalent to that of aluminum. Magnesium is used in appropriate locations to reduce weight while ensuring robustness. An HLA (High-response Linear Actuator) enables high-speed, quiet and highly accurate autofocusing.
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