Tamron AF 180mm f/3.5 Di SP A/M FEC LD (IF) 1:1 Macro Lens for Canon Digital ...

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Product Overview

• Style: For Canon DSLR Cameras

From the Manufacturer This unique high-performance telephoto macro lens is
equally at home in the field and in the studio, providing outstanding image
quality at all distances, plus an extra-long working distance for unsurpassed
subject access. An advanced optical design incorporating special LD glass and
internal focusing (IF), it has a handy Filter Effect Control (FEC) ring for
adjusting polarizing filters and an AF/MF ring for easier switching from
manual to auto-focus. SP AF180mm F/3.5 Di Features Di Digitally Integrated
Design (Di), is a designation Tamron puts on lenses featuring optical systems
designed to meet the performance characteristics of digital SLR cameras.
Filter Effect Control (FEC)to Enhance the Operational Ease of your Polarizing
Filter Use The Filter Effect Control is designed to rotate the filter to the
desired position while the hood is attached. This is accomplished by turning
the FEC ring that in turn rotates the portion of the filter mount where the
filter is mounted. Internal Focusing (IF) System Internal focusing 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. 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. 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.) Auto-
focus/Manual-focus (AF/MF) Switch Mechanism on the Focus Ring The ability to
switch quickly between auto-focus (AF) and manual-focus (MF) is a great asset
in many types of shooting, especially sports and nature photography. This is
easily accomplished with Tamron’s ingenious AF/MF system. By simply sliding
the focus ring back and forth between the two positions you can select either
the AF or MF focusing position. In manual-focus mode Tamron lenses provide
smooth, precise manual focusing by turning their wide, well-textured focusing
rings.