Tamron 18-270mm f/3.5-6.3 Di II VC PZD Aspherical Lens Pro Kit for Canon EOS - E2TM18270VCEOSPZD
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|MAIN FEATURES 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 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 effectively compensate for changes in aberrations due to zooming, the zoom lens employs an innovative optical system that is designed to converge the angles of rays of light entering from the center to the periphery of the lens. The light rays thus reach the image sensor within a defined circle that assures high imaging performance and reduces light falloff. High resolution performance As a lens exclusively designed for digital SLR cameras, this zoom lens delivers high resolution and contrast performance for outstanding image quality with sufficient flatness of the field under an extremely wide range of photographic conditions. Thorough countermeasures, including advanced internal surface coatings, prevent ghosting and flare Tamron employs multi-layer coatings in order to reduce reflections on lens surfaces as well as internal surface coatings (coatings on the cemented surfaces of lens elements) in order to minimize reflections from the sensor itself within the mirror box, a problem inherent to all digital SLR cameras. The world's first and greatest zoom power of 15X plus built-in VC mechanism achieved along with a remarkably slim maximum diameter of less than 80mm Designing a lens with the world?s first and greatest zoom ratio of 15X inevitably entailed a larger travel distance of the components within the optical systems, but Tamron has successfully accommodated the optical system as well as the special VC mechanism in a remarkably compact and slim package by employing mechanical design technology accumulated over many years. The result: A slim design measuring less than 80mm in diameter despite the fact that it is an ultra high power zoom lens that incorporates a VC mechanism. Production engineering this unique zoom lens meant incorporating complex optical/mechanical components, and Tamron's engineers had to employ innovative manufacturing techniques including methods of further enhancing accuracy, reducing weight, and increasing the strength of many components. Note: In order to achieve the world's first and greatest zoom ratio of 15X, metal mounts are used in both Canon- and Nikon-mount lenses. Zoom lock mechanism for convenience in carrying the outfit The lens has a built-in zoom lock mechanism to prevent its barrel from sliding forward when the lens is being carried on the camera. Flower-shaped lens hood as a standard accessory The lens is supplied with a flower-shaped lens hood as a standard accessory. It is designed to efficiently cut harmful light entering at angles other than intended angles at all four corners of the frame. This ensures clear, flare-free images. Outer design matches the newest generation high power zoom lens in the digital era The lens employs a new outer design that is more refined and smoother in its overall contours by minimizing concavity, convexity, and variations in profile in order to match the latest digital SLR cameras. A gold-colored metal ring is placed at a key portion of the lens as used in other Di II lenses. The TAMRON logo placed in the center portion of the lens enhances visibility of the brand while refining the overall design. Delicate matte finish is added to the black painting over the lens barrel in order to enhance the high quality appearance of the lens. The textured rubber pattern of the zoom and focus control rings has been improved again to a more pronounced, easy to grasp design than the conventional rubber pattern, for better feel and touch in manipulating the lens. Specifications Focal Length: 18-270mm Maximum Aperture: F/3.5-6.3 Minimum Aperture: F/22 - F/40 Angle Of View: 75 degrees 33' - 5 degrees 55' (equivalent angles of view when converted to 35mm) Lens Construction: 16 elements / 13 groups MFD (Minimum Focus Distance): 0.49m (19.3) (entire zoom range) Diaphragm Blades: 7 Filter Size: 62mm Overall Length: 3.5 Maximum Diameter: 2.9 Max. Mag. Ratio: 1:3.8 (at f=270mm) Standard Accessory: Flower-Shaped lens hood|
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