[Mint] Tamron AF 17-50mm F/2.8 XR Di-II LD SP for Konica Minolta and Sony 1393

---

Product Overview

• Style: Konica Minolta & Sony
• Set: US Version

From the Manufacturer The SP AF17-50mm F/2.8 is a lightweight, compact, fast
standard zoom lens designed exclusively for digital SLR cameras, expanding the
product concept of the popular SP AF28-75mm F/2.8 zoom lens. In addition,
portrait shots are made beautiful with the natural out-of-focus effect
characteristic provided by the fast F/2.8 aperture. Additionally, a broader
photographic expression through the use of faster shutter speeds as a result
of the maximum aperture offers enhanced photographic pleasure. The lens boasts
one of the best close-up shooting performances in the class of fast standard
zoom lenses designed exclusively for digital cameras and featuring an F/2.8
maximum aperture throughout the entire zoom range, to ensure stress-free
photographic shots at all focal lengths and distances. AF18-200mm F/3.5-6.3 XR
Di II Highlights Di II Lenses are designed for exclusive use on digital
cameras with smaller-size imagers and inherit all of the benefits of our Di
products. These lenses are not designed for conventional cameras and digital
cameras with image sensors larger than 24mm x 16mm. Extra Refractive Index
Glass (XR) Extra Refractive Index (XR) 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 by hand. Low
Dispersion (LD) 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.) Super
Performance (SP) for Discriminating Shooters Tamron SP (Super Performance)
series is a line of ultra-high-performance lenses designed and manufactured to
the exacting specifications demanded by professionals and others who require
the highest possible image quality. In creating SP lenses Tamron’s optical
designers put their foremost priority on achieving superior performance
parameters—they are all designed to a higher standard with little regard for
cost constraints. As a result, Tamron lenses bearing the SP designation
feature impressive and innovative designs that have established an enviable
reputation for excellence among those knowledgeable photographers that demand
the very best. Zoom Lock (ZL) Another original Tamron mechanical engineering
concept is the Zoom Lock (ZL), a simple convenience feature that prevents
undesired extension of the lens barrel when carrying the camera/lens unit on a
neck strap.