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Sigma has refined optical technology, in order to fully realize the possibilities of single lens reflex cameras and to respond exactly to the demands of the photographer, helping him to bring his vision to reality. Sigma’s huge choice of lenses enables photo enthusiasts to maximize their creativity. Each and every Sigma lens offers optimum optical performance and smooth handling characteristics through a combination of experience and advanced technology. Sigma’s design and precision engineering helps photographers to maximize their true creativity by fulfilling the full potential of their cameras.
Wide Zoom Lens Standard Lens Telephoto Lens Wide Lens Macro Lens DC Lens / DN Lens
LENS TECHNOLOGY ASP (Aspherical Lens) The aspherical lens complex allows freedom of design, with high lens performance, reduced number of components, and compact size. This lens provides high optical performance while maintaining a compact size. For example, the 12-24 mm f/4.5-5.6 EX DG ASPHERICAL lens widens the range of wide-angle lenses, and it provides distortion-free images with image reproduction performance equivalent to that of a single-focal length lens. Aspherical lenses allow the production of high-quality images from compact, lightweight telephoto zoom lenses. OS (Optical Stabilizer) Function This is a feature built into lenses that compensates for camera shake. It dramatically expands the realms of photography by alleviating camera movement when shooting handheld. The OS function uses two sensors inside the lens to detect vertical and horizontal movement of the camera and works by moving an optical image stabilizing lens group to effectively compensate for camera shake. The OS function offers the equivalent of using a shutter speed 4 stops faster making it suitable for telephoto and low light photography. Sony and Pentax mount lenses equipped with OS, such as 18-250mm F3.5-6.3 DC OS HSM and 18-50/2.8-4.5 DC OS HSM, can be used even if the camera has a built-in camera shake reduction system.* As the stabilizing feature is built into the lens, it can be designed specifically to suit the characteristics of that lens. This provides precise compensation for camera shake throughout the entire zoom range. This also enables the correctly stabilized image to appear in the viewfinder aiding autofocus and composition. *For Sony mount, the stabilizer function (OS) will function with all Konica Minolta and Sony Digital SLR cameras. It is not possible to use the OS function with film SLR cameras. Camera shake correction mechanism OFF Camera shake correction mechanism ON *For Pentax, the OS will function with Digital SLR cameras except *ist Series and K100D. It is not possible to use the OS function with film SLR cameras. * When the OS function of lens body is used, please turn the stabilizer function of camera body off. HSM (Hyper-Sonic Motor) HSM lenses are equipped with a motor driven by ultrasonic waves. The motor makes high AF speeds and quiet shooting a reality. IF (Inner Focus) To ensure stability in focusing, this lens moves the inner lens group or groups without changing the lens' physical length. RF (Rear Focus) RF lenses are equipped with a focusing system that moves the rear lens group for high-speed, silent focusing. Inner and Rear Focus   Conventional focusing has normally been performed by moving either all lens groups as a fixed unit or only the first lens group. AF cameras are now widely used, even for close-up photography. Consequently, demand has arisen for a focusing system that will keep the length of the lens unchanged while showing little fluctuation of aberration. In response to this demand, SIGMA has developed a new inner focus system that moves two lens groups inside the telephoto and telephoto MACRO lenses. This system has floating elements that substantially improve the close-up capability of the lens. The super wide angle lens having a large front-lens uses a rear focusing system to move the rear-lens apparatus and enhance the floating effect, and the 18-200mm F3.5-6.3 DC features an inner focusing system to move the secondary lens group during focusing. This lens has a minimum focusing distance of 45 cm / 17.7 inch throughout entire zoom range. The rear focus system ensures high-speed focusing with the wide lens 20mm F1.8 EX DG ASPHERICAL RF. APO MACRO Super   Although telephoto zoom lensescan be used closer to the objectthan fixed focal length telephotolenses, there is still a minimumshooting distance. SIGMA hasmade this minimum distance smaller and developed the zoom MACRO lensfor taking close-up photographs of the same quality as those taken with aregular MACRO lens, while maintaining the performance specific to anAPO lens. Rather than carrying around the cumbersome accessoriesrequired for close-up work, the photographer can now take photographs ata magnification of 1:2 (one halflifesize) using a telephoto lens, byquickly shifting from the normalsetting to the full macro setting. APO (APO Lens) In order to attain the highest quality images, the APO lens has been made using special low-dispersion (SLD) glass and is designed to minimize color aberration. SIGMA's APO zoom lenses minimizecolor aberration. As the refractiveindex of glass depends on thewavelength of light,color aberrationoccurs when different colors formimages at different points. Thisproblem often occurs with telephotolenses,but the Special Low-Dispersion(SLD) glass and Extraordinary LowDispersion (ELD) used in SIGMA'sAPO lenses helps to compensate forcolor aberration, thereby allowingthem to produce of sharp images. Conv (APO Teleconverter EX) The "CONV" mark designates lenses that can be used with the APO Teleconverter EX (sold separately). The teleconverter increases the focal length and interfaces with the AE (automatic exposure) function of the lens. EX (EX Lens) With uncompromised design ideas and high-level optical technology and handling, these lenses, which are Sigma's representative lenses, meet the requirements of photographers at the highest level. DG (DG Lens) These are high-performance lenses optimized for digital cameras. They are ideal not only for 35 mm digital SLR cameras and film SLR cameras but also for APS-C digital SLR cameras. They deliver superior image quality by correcting for all types of aberration, especially distortion, and they have high resolution capability because they minimize chromatic aberration of magnification, which is particularly a problem for digital cameras. What is more, these lenses incorporate optical designs optimized for digital cameras and Sigma's own Super Multi-Layer Coating technology, so they reduce flare and ghosting due to reflection between the image sensor and lens surfaces, and they provide high contrast and a wide range of tone. They also provide enough peripheral brightness with little vignetting. DC (DC Lens) These are dedicated digital SLR camera lenses with an image circle designed to suit image sensors that correspond to APS-C size. In-house technology accumulated through the development of our digital SLR camera was used to optimize optical performance for our digital lenses. This is a high-performance lens series that fuses technology such as lens power layout and coating design with the know-how Sigma has built up over many years of developing interchangeable lenses for SLR cameras. By reducing the diameter of the image circle, Sigma has achieved a more compact, lightweight lens series. * An image sensor larger than those corresponding to the APS-C size cannot be used in digital SLR cameras, 35 mm SLR cameras, or APS film SLR cameras. If such an element is used, vignetting will occur on the picture surface. The angle of view varies depending on which camera model the lens is used with. 35mm format is approximately 1.5 - 2.0 times the focal length of the lens being used. Floating System   The floating system is used to control the focus. This system moves the different lens groups in the optical system to different positions, thereby minimizing the telescoping distance and the fluctuation of aberration at different shooting distances. This system is particularly effective for macro lenses (which encompass a wide range of shooting distances) and wide-angle lenses (for Single-Lens Reflex cameras) whose lens composition is asymmetric. SIGMA uses the floating system for the MACRO 50 mm f/2.8 EX DG lens and the large-aperture wide-angle 28 mm f/1.8 EX DG ASPHERICAL MACRO lenses. DF (Dual Focus) System   The DF (Dual Focus) system disengages the linkage between the internal focusing mechanism and outer focusing ring when the focusing ring is moved to the AF position. This system provides easy and precise handling of the lens, since the focusing ring does not rotate during autofocusing. The wide focusing ring also enables easy and accurate manual focusing.

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