- Product Description: Tamron SP A016 - wide-angle zoom lens - 17 mm - 50 mm.
- Lens System: Wide-angle zoom lens.
- Intended for APS-C DSLR cameras.
- Lens Aperture: F/2.8 , Angle of view 78-31.
- Focal Length: 17 mm - 50 mm.
- Optical Zoom: 3 x.
- Min Focus Range: 27 cm.
- Focus Adjustment: Automatic, manual.
- Lens Construction: 13 group(s) / 16 element(s).
- Special Functions: Wide angle, zoom.
- Filter Size: 67 mm.
- Length: 8.2 cm.
- Weight: 434 g.
Product Description
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High luminosity allows for professional image composition
The Tamron 17-50mm is an extremely high-quality standard zoom
with a high luminosity of 2.8 over the entire focal length range.
It belongs to the Super Performance (SP) class of Tamron lenses
distinguished by ultra high optical and mechanical quality. The
high luminosity that this lens offers is ideal for low-light
conditions and professional image composition. The result is
images with smooth, even bokeh (background blur), where the
subject is virtually released from the background.
The incredibly short minimum focus distance of only 27cm was
achieved by using 3 XR glass elements (Extra Refractive) in the
front group, coupled with a new mechanical design, whilst at the
same time keeping the construction compact. The maximum
magnification ratio of 1:4.5 and low weight of just 430g are
added to the many features of this lens. Image defects are kept
at an absolute minimum through the application of aspherical
elements and LD (Low dispersion) glass as well as a special
coating of internal glass surfaces (Internal Surface Coating).
The result is especially sharp and high-quality images.
Diagram of XR Tube
Super Performance for Discriminating Shooters (SP)
--------------------------------------------------
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.
Di-II Lenses
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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 also include properties to
optimise digital imaging performance.
Special Glass for Better Performance and More Compact Lens
Designs
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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 minimising optical aberrations.
This has allowed Tamron to develop a line of short,
small-diameter, light lenses without sacrificing lens speed, and
actually upgrading image quality compared to older designs. XR
glass yields enhanced optical power distribution, making possible
many of the lens designs that bear the XR designation. XR glass,
with its exceptional 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 light,
compact lenses of the same speed, and also to provide great zoom
ranges in lenses that are much more convenient to carry and
hand-hold.
Low dispersion glass reduces chromatic aberration
Low Dispersion (LD) Glass for Greater Lens Sharpness
----------------------------------------------------
Low dispersion (LD) glass elements in a lens help reduce
chromatic aberration, i.e. the tendency of light of different
colours to come to different points of focus at the image plane.
Chromatic aberration reduces the sharpness of an image, but glass
with an extremely low dispersion index has less of a tendency to
separate (diffract) a ray of light into a rainbow of colours.
This characteristic allows the lens designer to effectively
compensate for chromatic aberration at the centre 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.)
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 as the lens length does not change
during focusing. Crucially, Tamron’s Internal Focusing (IF)
system provides a close minimum focusing distance (MFD)
throughout its entire focusing range. Also, IF improves optical
performance by minimising illumination loss at the corners of the
image field, and helps to suppress other aberrations that become
more troublesome at different focusing positions.
Aspherical lens elements reduce spherical aberration
Hybrid Aspherical Elements Provide the Ultimate in Image Quality
and Compactness
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Tamron uses several hybrid aspherical lens elements in many
lenses bearing the Aspherical designation. These innovative
optics allow us to achieve exceptional 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 virtually
eliminated spherical aberration and image distortion from the
high-power-zoom series. Through the effective application of
Hybrid Aspherical Technology, one lens element can 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.
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