Tamron A14 AF18-200MM F/3.5-6.3 XR Di II LD All-In-One Zoom Nikon Camera
Lens - AF014NII700
The 18-200mm F/3.5-6.3 XR Di-II blends optical performance, convenience and versatility in the world's lightest, most compact 11.1x zoom for digital SLR cameras. Precision optics and a collection of Tamron technologies work in concert to deliver outstanding image clarity, and the freedom of wide-angle-to telephoto shooting with just one lens. Fewer lens changes means your DSLR's image sensor is exposed to picture-degrading dust less often, safeguarding consistent image quality. Streetscapes and confined interiors come to life at 18mm. Far away subjects are reined in easily at 200mm, which is made even more powerful by the inherent crop factor of APS-C-sensor DSLRs—a benefit that causes magnification equivalent to a 310mm lens on a full frame (36mm x 24mm) digital or 35mm film SLR. Of course, every focal length in between offers the continuous framing control to apply personal preference to every shot.
Lenses are engineered expressly for digital SLR cameras with image sensors commonly referred to as APS-C, measuring approximately 24mm x 16mm. Rendering an ideal image circle for APS-C sensors, Di-II lenses are also include properties to optimize digital imaging performance.
Special Glass for Better Performance and More Compact Lens Designs
XR (Extra Refractive Index) glass can bend light rays at steeper angles, thereby decreasing the physical length of the lens while enhancing imaging performance by minimizing optical aberrations. This has allowed Tamron to develop a line of shorter, smaller-diameter, lighter lenses without sacrificing lens speed, and actually upgrading image quality compared to older designs. XR glass is costlier than conventional glass but it yields enhanced optical power distribution, making possible many of the outstanding and innovative lens designs that bear the XR designation. XR glass, with its superior light-bending power, makes it possible to design a short-barrel lens with the same light-gathering ability (aperture value) as a long-barrel lens—even with a smaller lens diameter. By using this principle Tamron has been able to shorten the length of the entire optical system and produce lighter, more compact lenses of the same speed, and also to provide greater zoom ranges in lenses that are much more convenient to carry and hand-hold.
Low Dispersion (LD) Glass for Greater Lens Sharpness
Low dispersion (LD) glass elements in a lens help reduce chromatic aberration; the tendency of light of different colors to come to different points of focus at the image plane. Chromatic aberration reduces the sharpness of an image, but glass with an extremely lowdispersion index, has less of a tendency to separate (defract) a ray of light into a rainbow of colors. This characteristic allows the lens designer to effectively compensate for chromatic aberration at the center of the field (on axis), a particular problem at long focal lengths (the telephoto end of the zoom range), and for lateral chromatic aberration (towards the edges of the field) that often occurs at short focal lengths (the wide-angle end of the zoom range.)
Hybrid Aspherical Elements Provide the Ultimate in Image Quality and Compactness
Tamron uses several hybrid aspherical lens elements in many lenses bearing the Aspherical designation. These innovative optics allow us to achieve the ultimate in image quality, and at the same time produce lenses that offer remarkable zoom ranges in extraordinarily compact packages. By perfecting theses cutting-edge advances for series production, Tamron has advanced the state of optical design, and virtually eliminated spherical aberration and image distortion from the high-power-zoom series.Through the effective application of Hybrid Aspherical Technology, one lens elemen tcan take the place of multiple elements without compromising performance. This is what allows us to produce remarkably compact long-range lenses that deliver a uniformly high level of image quality at all focal lengths and apertures.
Internal Focusing (IF) System
Internal focusing (IF) provides numerous practical benefits to photographers including a non-rotating front filter ring that facilitates the positioning of polarizing and graduated filters, and more predictable handling because the lens length does not change during focusing. Even more important, Tamron’s Internal Focusing (IF) system provides a much closer minimum focusing distance (MFD) throughout its entire focusing range. In addition, IF improves optical performance by minimizing illumination loss at the corners of the image field, and helps to suppress other aberrations that become more troublesome at different focusing positions.
- Lens Construction (Groups/Elements): 13/15
- Angle of View: 75°-7°
- Diaphragm Blade Number: 7
- Minimum Aperture: F/22
- Minimum Focus Distance: 17.7in.(0.45m)
- Macro Magnification Ratio: 1:3.7 (at f=200mm MFD 0.45m)
- Filter Diameter: ø62
- Length ø2.9 x 3.3in. (ø73.8 x 83.7mm)
- Unit: 14 oz
- Shipping: 2 lbs
- Manufacturer Warranty (authorized online retailer): Limited 6 Years