Sigma - 30mm f/1.4 DC HSM A Digital Prime Lens for Select DSLR Cameras - Black

Thermally Stable Composite Material (TSC). The HSM ensures quiet, accurate and high-speed autofocus the reduces flare and ghosting, while the TSC reduces expansion and contraction of the internal lens barrel. An optimized autofocus algorithm achieves smooth focusing while a 9-blade rounded diaphragm creates beautiful bokeh. Under the Global Vision standard, every lens will be tested before using the Sigma A1 MTF system to ensure the highest degree of quality possible and also features capability with the optional USB dock Includes a lens hood and padded carrying case. Key Features: Art line delivers high-level artistic quality: Sigma is organizing all its interchangeable lenses into three product lines Contemporary, Art, and Sports, where each line has a distinctive concept. Designed with a focus on sophisticated optical performance and abundant expressive power, the Art line delivers high-level artistic expression. With the astonishing rendering performance that meets very high standards, along with landscapes, portraits, still-life, close-up and casual snaps, they are perfect for the kind of photography that unleashes the inner artist. Ideal for studio photography, they offer just as much expressive scope when capturing architecture and starry skies and many other scenes A large aperture f/1.4 standard lens: The 30mm f/1.4 Art lens offers the shallow depth of field of f/1.4 The bright viewfinder also aids focusing and composition of images Outstanding image quality for enhanced photographic expression: The Sigma 30mm f/1.4 Art has outstanding optical performance in order to fully perform its best expressive quality at all shooting distances. Optimized power distribution minimizes field curvature thereby preventing a loss of image quality at the edges of photographs. The use of a double aspheric lens minimizes spherical distortion, astigmatism and coma. Coma of point light sources is minimized near the edge of the image, and an attractive round bokeh effect is produced at large-aperture settings Rear Focus system: The lens incorporates a rear focus system that prevents focus-dependent variation in aberration, making high-level image quality possible throughout the entire image. With their unchanging barrel length, rear focus lenses also enhance balance and stability for the photographer. Furthermore, since the front of the lens does not rotate, polarizing filters can be used with extra convenience Flare and ghosting conscious design: Flare and ghosting were thoroughly measured and monitored from the lens development stage to establish an optical design which is resistant to strong incidental light such as backlight