This line of ultra-high-performance lenses is designed and manufactured to the exacting specifications demanded by professionals and others who require the highest possible image quality. The foremost priority is achieving superior performance parameters – high design standards take priority over cost constraints. As a result, Tamron SP lenses feature innovative designs that have established an enviable reputation for excellence amongst demanding photographers.
|Molded Glass Aspherical element|
Optimal relative illumination
This SP lens delivers exceptionally uniform illumination levels across the image field to avoid non-linear pattern or fall-off toward corners.
Far superior image quality – while reducing lens size and weight
Tamron uses several hybrid aspherical lens elements in its lenses bearing the Aspherical designation. The benefits are two-fold: first, in SP lenses of fixed focal length, molded glass aspherical elements deliver planarity in field curvature. These elements ensure superb focusing uniformity over the entire field by compensating for spherical and comatic aberrations. Second, as one hybrid aspherical lens element can take the place of multiple elements without compromising performance, they allow the lens to be much more compact.
Sharpens edges by reducing 'colour fringing'
Chromatic aberration occurs when a lens element refracts different wavelengths of a ray of light – its rainbow colours – at very slightly different angles. This results in the 'colour fringing' that reduces the sharpness of an image. LD elements are made from special glass materials with extremely low dispersion indices (i.e. the refraction of a ray of light into rainbow colours is extremely narrow). Thus they 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 (toward the edges of the field) that often occurs at short (wideangle) focal lengths.
Although costly, LD glass materials result in clear, vivid image quality.
Advanced lens coating produces even sharper, crisper images
This new coating technique developed by Tamron deploys a nano-structured* layer with dimensions smaller than the wavelengths of visible rays of light. Called eBAND (extended Bandwidth & ANgular-Dependency), its ultra-low refractive index, combined with the sophisticated multiple-layer coatings underneath, yields significant anti-reflection properties, absolutely minimising flare and ghosting to deliver sharp, crisp images.
*1nm = 1/1,000,000mm
Broad-Band Anti-Reflective coating
Cleaner, crisper images without flare or ghosting
BBAR coating provides crystal-clear images by suppressing element surface reflections that lead to ghosting and flare.
Developed for industrial optics, fluorine coating offers long-lasting oil and water resistance to the lens. Moisture and smudges wipe away, making it easy to keep your lens clean.
9 diaphragm blades for superb blur quality
The number of diaphragm blades affects the "shape" of the blur in out-of-focus areas of the image. This is more important in portraiture, where the aperture setting is often wide open, and macro photography, where the high magnification results in blurred background and foreground even at narrow apertures. When backgrounds are soft and blurred, not only is the effect very pleasing and "photographic", but it also serves to isolate the subject from a distracting background, providing a professional-looking image. A high number of blades provides a rounder shape to the aperture, which in turn makes the shape of the blur more circular and much more natural.
Super Performance series
Performance takes priority for superb image quality
Constructed to prevent moisture from entering the internal mechanisms of the lens, the SP line is sealed to allow photographers to shoot outdoors in adverse conditions.
Ultrasonic Silent Drive
'Travelling waves' generate a fast, smooth AF movement
This extremely quiet motor is ideal for photography of events, weddings, theatre or musical performances, as well as crucial moments on the golf course – any situation where autofocus noise is obtrusive. Major improvements in autofocus response and tracking ability over standard DC motors make for instantaneous focusing and spontaneous shooting of rapidly moving subjects.
Tamron’s USD works with the high-frequency ultrasonic vibrations that are produced by a ring called a ‘stator’. Energy from the vibrations is used to rotate an attached metallic ring known as the ‘rotor’. Piezoelectric ceramic is a material that produces ultrasonic vibrations when voltage of a specific frequency is applied is arranged in a ring formation on the stator. This electrode configuration of piezoelectric ceramic causes two ultrasonic vibrations to occur in the stator. By effectively combining these two ultrasonic vibrations, it is possible to convert the energy from the vibrations that produce simple motion into energy known as ‘deflective travelling waves’, which move around the circumference of the ring. The friction between these deflective travelling waves created on the metallic surface of the stator and the surface of the rotor produces force, causing the rotor to rotate. Attached to the rotor is the focusing lens, which is given a fast, smooth autofocus movement.
|Lens construction||10 elements in 8 groups|
|Angle of view (diagonal)||51°21' for full-frame format
34°28' for APS-C format
|Number of diaphragm blades||9 (circular diaphragm)|
|Minimum focus distance||0.29m (11.4 in.)|
|Macro magnification ratio||1:3.4|
|Front filter thread||67mm|
|Length*||91.7mm (3.6 in.) for Canon
89.2mm (3.5 in.) for Nikon
|Weight||540g (19oz) for Canon
520g (18.3oz) for Nikon
|Supplied accessories||Flower-shaped lens hood, lens caps|
|Mounts available||Canon, Nikon, Sony***|