Sigma has announced the 30 mm f/1.4 DC DN Contemporary lens for mirrorless cameras, and the 50-100 mm f/1.8 DC HSM Art lens for APS-C cameras.
[Sigma lenses with “DC” in the name are designed for optimal performance on cameras with APS-C image sensors, while those with “DN” in the name are designed for optimal performance on cameras with a short flange back distance.]
The 30 mm lens is the equivalent of 60 mm on the Micro Four Thirds system and 45 mm on the Sony E-mount system.
The company says the lens delivers optimal balance with light, compact camera bodies having a short flange back distance, and the design of the focus lens group allows fast and smooth AF performance for videography.
The front lens element features high-refractive index, high-dispersion glass for extra power and a shorter overall lens length. To optimize the lens for mirrorless cameras, two aspherical lens elements help ensure outstanding image quality and overall compactness. The lens features inner focus technologies, while lighter lens elements in the focus lens group make possible a more compact actuator. Sigma says the lens delivers an outstanding level of light to the edges of the image while minimizing lateral chromatic aberration. To correct distortion, the lens takes advantage of the image correction capabilities of the mirrorless camera body, using the corrective power of the optical system to enhance sharpness. The final result is an extremely compact lens that delivers image quality that rivals that of the company’s Art line lenses.
By incorporating a stepping motor, the lens offers exceptionally quick and quiet auto-focusing, notes the company, and is also compatible with Sony E-mount Fast Hybrid AF.
The lens is made of a new material called Thermally Stable Composite (TSC), said to be highly elastic and exhibiting minimal deformation, with thermal expansion characteristics similar to those of aluminum.
The lens will be offered in Micro Four Thirds and Sony E-mount.
Sigma’s second f/1.8 Art zoom lens for APS-C sensors is the 50-100 mm f/1.8 DC HSM Art, which the company says is the world’s first APS-C zoom for DSLRs to offer a constant f/1.8 aperture value throughout the zoom range.
To help minimize axial and transverse chromatic aberration, this lens features an optimal arrangement of three FLO (“ F” Low Dispersion) glass elements, one SLD (Special Low Dispersion) glass element, three high-refractive index SLD glass elements, and one high-refractive index, high-dispersion glass element. By including one or more low-dispersion element in every element group, notes Sigma, this lens ensures outstanding image quality throughout the zoom and focal range.
FLO glass is ultra-low-dispersion glass, highly transparent, and its refractive index and dispersion are extremely low compared to conventional glass. It offers characteristics very similar to those of fluorite. These characteristics minimize residual chromatic aberration (secondary spectrum), which cannot be corrected by ordinary optical glass, while helping to produce sharp, high-contrast images.
The optical design is said to be resistant to strong incidental light sources such as backlight.
Sigma has enhanced its Hyper Sonic Motor (HSM). Optimizing the layout as well as the shapes of the individual parts, the HSM is 30 percent slimmer than before.
The diaphragm blades feature Carbon Feather film, and the diaphragm unit features a new polycarbonate made with fluorine, delivering diaphragm operation which is exceptionally smooth even during continuous shooting, says the company, while the new polycarbonate is exceptionally durable and wear-resistant.
With inner focus and inner zoom, adjusting the focus and zoom rings does not change the length of the lens, and turning the zoom ring is not prone to cause focus shift.
The tripod socket is compact, making operation more stable and comfortable during handheld photography.
The lens will be available in Nikon, Canon and Sigma mounts.
The Sigma 30 mm f/1.4 DC DN Contemporary lens has a suggested retail price (SRP) of $459.95 and is expected to be available in April.
The Sigma 50-100 mm f/1.8 DC HSM Art lens has an SRP of $1,549.95 and is expected to be available in May.