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  • Frys.com #7960790
  • Manufacturer: TAMRON USA
  • UPC #725211167112
  • Model #AFB016NII-700
    • Give Your Digital Camera a New Outlook on Life

    Setting high-performance DSLRs free with SP engineering, strengthened by F/2.8 maximum aperture advantages.

     

     

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    Detail Description
    Detailed Description
    (Manufacturer # AFB016NII-700 )

    Overview
    The Tamron SP designation is reserved for lenses developed with special emphasis on extraordinary photographic performance. Engineers are free to innovate in an uncommon atmosphere where optical performance comes before price, resulting in lenses that satisfy the demands of discerning photographers.

    One of two Tamron 17-50mm F/2.8 offerings, the image integrity and compositional options afforded by the SP 17-50mm F/2.8 Di-II's wide-to-moderate-telephoto zoom characteristics are prized by experienced photographers. Both versions of the SP 17-50mm F/2.8 stem from the long-successful SP 28-75mm F/2.8—originally designed for 35mm film SLRs. Later refined to meet the needs of high-resolution digital SLRs with APS-C-format sensors, and like its further refined variant (the SP 17-50mm F/2.8 XR Di-II VC, model B005), the 17-50mm renders a picture angle range approximating a 26-78mm lens on a full frame DSLR or a 35mm SLR. A fast and constant F/2.8 maximum aperture benefits photographers in several ways, including the ability to render cluttered backgrounds well out of focus, expanded low-light shooting freedom and a brighter viewfinder image. With its mildly less complex optical formula and without tri-axial VC (Vibration Compensation), the SP 17-50mm F/2.8 Di-II (model A16) stands out as a remarkable value and a favorite of passionate photographers.
    Recommended for APS-C photographers who...
    • Enjoy being able to switch from streetscapes and interiors to portraits and headshots, without switching lenses.
    • Demand optical performance and handling characteristics designed to meet the needs of professional and experienced non-professional photographers.
    17mm (27mm full frame)
    28mm (43mm full frame)
    50mm (77mm full frame)
    Technology
    Tamron Di-II 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.

    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.

    Specifications
    Model A16
    Lens Construction (Groups/Elements) 13/16
    Angle of View 78°45'-31°11' (APS-C size equivalent)
    Diaphragm Blade Number 7
    Minimum Aperture F/32
    Minimum Focus Distance 10.6in.(0.27m)
    Macro Magnification Ratio 1:4.5 (at f=50mm MFD 0.27m)
    Filter Diameter ø67
    Weight 430g (15.2oz)
    Diameter x Length ø2.9 x 3.2in. (ø74.0 x 81.7mm)
    Accessory Flower-shaped Lens hood








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