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By revolutionizing the optical and structural design of the Sigma 18-250mm F3.5-6.3 DC OS HSM, this lens achieves a compact size and a minimum focusing distance of 35cm. New material, Thermally Stable Composite (TSC) maintains its structure and has little contractility especially in varying temperatures, is incorporated into the lens barrel. It is convenient when you wish to keep your equipment to a minimum and yet still be prepared for all opportunities and situations, such as travels. A wide range of photography is possible in one lens Covering wide angle 18mm to telephoto 250mm, this versatile lens designed exclusively for digital SLR cameras, is suitable for all-purpose photography including landscape, sport, and macro photography. It is convenient when you wish to keep your equipment to a minimum and yet still be prepared for all opportunities and situations, such as travels. Excellent for macro photography Close-up capability is improved with the minimum focusing distance of 35cm throughout the entire zoom range, and maximum magnification ratio of 1:2.9. In APS-C size equivalent, macro photography with approximately 1:2 magnification ratio is possible. In addition, with this lens, the size and framing of subjects can be adjusted by rotating a zoom ring, making macro photography easier than using fixed focal macro lens. For further convenience, the maximum magnification ratio at each focusing distance appears on the side of the lens barrel. Revolutionizing the design foundation results in compact size Optimization of the power arrangement by such as incorporating double-sided aspherical lenses, and reexamination of design, the filter diameter size is reduced. This compact size lens has the approximately 13x high zoom ratio with the filter size of diameter 62mm, and dimensions of diameter 73.5mm x Length 88.6mm. It ensures portability and overall ease of use, making it perfect for travel and leisure photography. TSC (Thermally Stable Composite) Material The material TSC (Thermally Stable Composite), which has little contractility especially in temperature changes, as well as maintaining firmness, is incorporated into the lens barrel. Compared to Polycarbonate which is generally used, TSC has higher elasticity by approximately 25%. Since thermal shrinkage is low, it has high affinity to metal parts which contributes to high quality product manufacturing. It also contributes to the parts such as the zoom ring and scaling to be slimmer. Brass made bayonet mount This lens incorporates brass made bayonet mount which has both high accuracy and solidity, same as the mount for camera body. The special treatment to reinforce the strength is applied on the surface to make it a high quality lens that is resistant for long-term use. Optical Stabilizer (OS) Sigma's own unique Optical Stabilizer (OS) function is incorporated. It offers effective correction of approximately 4 stops, which makes it possible to compensate camera shake even in macro range photography where a small blur can be easily identified. When photographing a moving subject such as motor sport, it automatically detects camera move, and offers effective correction for camera shake. Superior optical performance SLD (Special Low Dispersion) glass element offers excel
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SteadyShot INSIDE In-Camera Image Stabilization - A major reason for its compact, lightweight lens design is the benefit of SteadyShot INSIDE in-camera image stabilization, built into every a (alpha) DSLR camera enabling lenses to eliminate the extra weight and expense of in-lens stabilization mechanisms. DT Lens Design - A more compact, lightweight lens designed specifically for the APS-size CCD imager used in some Sony a (alpha) DSLR cameras. Smooth Autofocus Motor (SAM) - The built-in Smooth Autofocus Motor (SAM) eliminates the need to use a mechanical coupling system in the camera body to transfer auto foucs (AF) drive power and control signals to the lens. Instead, AF control signals from the camera body are sent to the lens-mounted SAM unit, which drives the focusing lens group directly, helping to assure smooth AF response. ED (Extra-low Dispersion) Glass - To reduce chromatic aberration at telephoto extension, correcting certain wavelengths of light for sharp, clear images with well defined colors. Circular Aperture - Because aperture blades form a near circle at the wide openings used for low-light shots, spot-light sources have a pleasing circular defocused effect. Product Specifications: Optics/Lens Aperture (Max.): f/1.8 Aperture (Min.): f/22 Filter Diameter: 49mm Lens Groups-Elements: 6 Elements / 5 Group Minimum Focus Distance: 1.1ft (0.34m) Aperture Blade: 7 blade circular aperure Focus Control Focal Length (35mm equivalent): APS-C 35mm eqv. 75mm Focus System: Front focus SAM (Smooth AF motor) Weights and Measurements Dimensions (Approx.): 2-6/8 x 1-6/8 (70 X 45mm) Weight (Approx.): 6oz (170g)
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The SIGMA 18-250mm F3.5-6.3 DC OS HSM incorporates Sigma's original anti-shake compensation function, with a 13.8 times zoom ratio. As opposed to having an anti-shake function in the camera body, this lens's Hybrid Optical Stabilizer provides not only an anti-shake function for the camera body, but also compensates for image shaking in the view finder as the Optical Stabilizer is built in to the lens. Incorporating four Special Low Dispersion glass elements and three aspherical lens elements provides excellent image quality throughout the entire zoom range. This lens has a minimum focusing distance of 45cm (17.7 inches) at all focal lengths and a maximum magnification of 1: 3.4 reproduction ratio, making it ideal for close-up photography. An inner focusing system eliminates front lens rotation, making it suitable for use with circular polarizing filters and the supplied petal-type hood. Incorporating super multi-layer coating reduce the ghost in the backlight photography. Warranty - 1 year America Warranty + 3 year USA extended warranty on manufacturing and workmanship for a total of 4 years of coverage from date of purchase. Specifications Focal Length: 18-250mm Minimum Aperture: F22 Lens Construction: 18 Elements in 14 Groups Angle of View: 69.3 - 5.7 degrees Number of Diaphragm Blades: 7 Blades Minimum Focusing Distance: 45 cm/17.7 in. Maximum Magnification: 1:3.4 Filter Size: 72mm Lens Hood: Petal-type hood Dimensions: Diameter 79mm X Length 101 mm (3.1 in. X 4 in.) Weight: 630g/22.2 oz.
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World's first and greatest zoom ratio of 15X, covering 28-419mm 35mm-equivalent angle of view Going back to the basic concept of 'one lens covering everything from wide angle to telephoto,' engineers at Tamron took up the difficult task of expanding the zoom range of Tamron's high power zoom lenses even further. Their unstinting efforts to extend the telephoto end beyond previous limits while retaining the wide-angle end at 18mm has borne fruit as an ultra high power zoom lens that is exclusively designed for DSLR cameras and boasts the greatest zoom range of 15X for the first time in the world. Tamron's original VC mechanism for effective shake-free hand-held photography Tamron's proprietary VC (Vibration Compensation) mechanism was built in the AF28-300mm F/3.5-6.3 Di VC (Model A20) for the first time. It demonstrated its powerful compensation effect employing a tri-axial system that is designed to let three coils drive a compensator lens electromagnetically via three steel balls. Since the compensator lens is supported on rolling steel balls with very low friction, follow-up performance is also enhanced, resulting in stabilized viewfinder images. Since the mechanism is designed to allow parallel shifting of the compensator lens solely by means of electrical control, the mechanical construction is simpler and more compact, so the lens can be kept as small and light as possible. Designing a high power, compact zoom lens with VC mechanism: Optical design optimization meets optimum power distribution In developing the long-range zoom lens, Tamron's optical designers pursued the optimum distribution of power within the overall optical system based on the optical design know-how Tamron accumulated over 16 years since the introduction of the first compact AF28-200mm in 1992. The resulting optical system uses two LD (Low Dispersion) glass elements and three aspherical elements in order to effectively compensate for various aberrations including astigmatism, yet this design allows the first optical group to be small enough in diameter to realize the overall goal of a compact lens that incorporates a handheld-shake compensation mechanism. Note: In order to realize the high zoom ratio of 15X, the optical system does not use any XR (extra dispersion glass) element. Instead, compactness is achieved through optimization of the power distribution within the whole optical system. Minimum focusing distance of 19.3 inch over the entire zoom range for the max. mag. ratio of 1:3.5 The AF18-270mm Di II VC allows close focusing down to 0.49m (19.3 inches) from the subject over the entire zoom range even though it incorporates the VC mechanism. The maximum magnification ratio of 1:3.5* at its 270mm telephoto end is the top class capability among high power zoom lenses exclusively designed for digital SLR cameras. *A format covered by an APS-C sized image sensor is smaller than that of 35mm format film. Therefore, this lens is capable of filling the frame by capturing an area that is almost the same as an area covered by a lens designed for the 35mm format and providing the maximum magnification ratio of 1:2.3. Optical system optimized for digital SLR cameras by taking incident rays of light reaching the image sensor into consideration In order to effec
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